The greek word sarx (sárks) means flesh, body, human nature, materiality; kindred

We can read in Strong’s lexicon: sárks is not always evil in Scripture. Indeed, it is used positively in relation to sexual intercourse in marriage (Eph 5:31) – as well as for the sinless human body of Jesus (Jn 1:14; 1 Jn 4:2,3). Indeed, flesh (what is physical) is necessary for the body to live out the faith the Lord works in (Gal 2:20).]

We are tempted in our flesh but since Jesus too was tempted (for example when he had an encounter with Satan in the desert) we can’t suggest that flesh in itself is sinful.  The only time in the Bible (KJV) where we can read about “sinful flesh” is in the below verse, and the reason why it says that Jesus came in the likeness of “sinful flesh” is because it’s our flesh which we could potentially use to sin. Flesh is not sinful in itself but we can use it to sin by application. Christians don’t walk “according” to the flesh but walk “in” the flesh, and we do have options. Also Jesus had the option to walk according to his flesh or not, and as we know; he chose to NOT walk after his flesh. God is the author of our flesh (Exodus 4:11, Isaiah 44:2, Jer. 1:5) and our flesh is made out of dirt (Gen. 2:7, Gen. 3:19).  If we give heed for temptation and choose to sin, then we have “sinful flesh“. Jesus was made in the likeness of men in the flesh (Philippians 2:7) and “flesh” is at times is synonymous with men (Gen. 6:12, Matt. 16:17).

Romans 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:

We would better watch out for false doctrines that might sneak into our Bible translations and/or churches. The idea that flesh is sinful in itself is nothing but GNOSTICISM, and this was considered heresy among all the old church fathers the first 300 years AD. It was Augustine, a former gnostic, who introduced a number of gnostic doctrines into the Church, and both Calvin and Luther continued to spread some of those ideas. That’s why some of us still believe in some false doctrines, such as the idea that we are born with a sinful nature, that flesh is sinful in itself, that we constantly sin in thoughts, words and deeds, infant baptism, once saved always saved, and that we’re saved by faith alone. 

Nowhere in the Bible does it say that we are born with a sinful nature (not even in Romans 5). We die physically due to Adam (we can’t reach the tree of life due to him, and the ground is cursed due to him) but we die spiritually when WE sin.  Sinning is something we DO, and it can’t be inherited. If we were able to inherit sin, then also Jesus would have inherited it, because also Mary had male ancestors. Some suggest that Jesus was born by a virgin in order to avoid “the sinful nature”, but according to Isaiah the virgin birth was supposed to be a SIGN. Nowhere in the Bible does it say that Jesus was born by a virgin in order to avoid some kind of mysterious genes which could cause us to get sinful bodies.

Jes. 7:¹⁴Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel

If all people apart from Jesus would be born in sin, this would DIMINISH what Jesus did for us because he wouldn’t have had the same sort of “disability” as the rest of us. We could then rightfully defend our sin with, ”It’s not that strange that Jesus managed to live a life free of sin unlike us, because he was not born with a sinful nature like the rest of us poor victims”.  Jesus was not given a single advantage over us! He did not come to this earth as some kind of a superman with an immunity to sin, or with a reduced ability to sin. He was tempted like us in all points but chose to not give in for sin:

Hebr. 4:¹⁵For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.

Our flesh can absolutely be used as a tool for sin, but most of us believe that Jesus managed to live a completely sinless life for our sake:

Matt. 5: ²⁹And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell. ³⁰And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.

Examples where the Greek word sarx (flesh) is used

We can see below that when the works of the flesh are listed, it’s obvious that you have to be an adult in order to be guilty of such sins, and you also have to be an adult in order to choose to live after the spirit and not after the flesh. Babies are not evil and they don’t have sinful bodies!

John 3:³Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God. ⁴Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born? ⁵Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. ⁶That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. ⁷Marvel not that I said unto thee, Ye must be born again.

Matthew 19:⁵And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? ⁶Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.

Matthew 24:²²And except those days should be shortened, there should no flesh be saved: but for the elect’s sake those days shall be shortened.

Matthew 26: 41Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak

Luke 3: ⁵Every valley shall be filled, and every mountain and hill shall be brought low; and the crooked shall be made straight, and the rough ways shall be made smooth;⁶And all flesh shall see the salvation of God.

John 6: ⁵¹I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world. ⁵²The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat? ⁵³Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. ⁵⁴Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. ⁵⁵For my flesh is meat indeed, and my blood is drink indeed. ⁵⁶He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him. ⁵⁷As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me. ⁵⁸This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.— ⁶³It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.

Acts 2:²⁶Therefore did my heart rejoice, and my tongue was glad; moreover also my flesh shall rest in hope: ²⁷Because thou wilt not leave my soul in hell, neither wilt thou suffer thine Holy One to see corruption.— ³¹He seeing this before spake of the resurrection of Christ, that his soul was not left in hell, neither his flesh did see corruption.

Romans 7: ⁴Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God. ⁵For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death. ⁶But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.

Romans 3: ¹⁹Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God. ²⁰Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin. (circumcision and the jewish ceremonial law is in focus)

Romans 8:²For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death. ³For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: ⁴That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. ⁵For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. ⁶For to be carnally minded is death; but to be spiritually minded is life and peace. ⁷Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be. ⁸So then they that are in the flesh cannot please God. ⁹But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. ¹⁰And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness. ¹¹But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you. ¹²Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. ¹³For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.

Hebr. 2:¹⁴Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; ¹⁵And deliver them who through fear of death were all their lifetime subject to bondage. ¹⁶For verily he took not on him the nature of angels; but he took on him the seed of Abraham.

Galatians 3:²This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith? ³Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh? (circumcision and the jewish ceremonial law is in focus)

Galatians 2:  ¹⁹For I through the law am dead to the law, that I might live unto God. ²⁰I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.

1 Corinthians 1:²⁸And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are: ²⁹That no flesh should glory in his presence.

1 Corinthians 15:³⁹All flesh is not the same flesh: but there is one kind of flesh of men, another flesh of beasts, another of fishes, and another of birds. ⁴⁰There are also celestial bodies, and bodies terrestrial: but the glory of the celestial is one, and the glory of the terrestrial is another.— ⁴⁵And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit. ⁴⁶Howbeit that was not first which is spiritual, but that which is natural; and afterward that which is spiritual. ⁴⁷The first man is of the earth, earthy; the second man is the Lord from heaven. ⁴⁸As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly. ⁴⁹And as we have borne the image of the earthy, we shall also bear the image of the heavenly. ⁵⁰Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.

2 Corinthians 7: ⁵For, when we were come into Macedonia, our flesh had no rest, but we were troubled on every side; without were fightings, within were fears.

2 Corinthians 10¹Now I Paul myself beseech you by the meekness and gentleness of Christ, who in presence am base among you, but being absent am bold toward you: ²But I beseech you, that I may not be bold when I am present with that confidence, wherewith I think to be bold against some, which think of us as if we walked according to the flesh. ³For though we walk in the flesh, we do not war after the flesh: ⁴(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;) ⁵Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;

Galatians 5: ¹⁶This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. ¹⁷For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would. ¹⁸But if ye be led of the Spirit, ye are not under the law. ¹⁹Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, ²⁰Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, ²¹Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. ²²But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,

Philippians 1:²²But if I live in the flesh, this is the fruit of my labour: yet what I shall choose I wot not. ²³For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better: ²⁴Nevertheless to abide in the flesh is more needful for you.

Philippians 3:³For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh. ⁴Though I might also have confidence in the flesh. If any other man thinketh that he hath whereof he might trust in the flesh, I more: ⁵Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee;

Philemon 1¹⁶Not now as a servant, but above a servant, a brother beloved, specially to me, but how much more unto thee, both in the flesh, and in the Lord?

1 Timothy 3:¹⁶And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.

1 Peter 3: ¹⁸For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:

1 Peter 4:¹Forasmuch then as Christ hath suffered for us in the flesh, arm yourselves likewise with the same mind: for he that hath suffered in the flesh hath ceased from sin; ²That he no longer should live the rest of his time in the flesh to the lusts of men, but to the will of God. ³For the time past of our life may suffice us to have wrought the will of the Gentiles, when we walked in lasciviousness, lusts, excess of wine, revellings, banquetings, and abominable idolatries: ⁴Wherein they think it strange that ye run not with them to the same excess of riot, speaking evil of you: ⁵Who shall give account to him that is ready to judge the quick and the dead. ⁶For for this cause was the gospel preached also to them that are dead, that they might be judged according to men in the flesh, but live according to God in the spirit.

1 John 4:²Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: ³And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world

2 John 1: ⁷For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.