When it comes to John 6 some reformers are more keen to quote John 6:39 than John 6:40, despite that the verses are very similar. The reason for this is probably the inconvenient conditions listed in John. 40.
John 6:39 And this is the Father’s will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day.
John 6:40 And this is the will of him that sent me, that every one which SEETH the Son, and BELIEVETH on him, may have everlasting life: and I will raise him up at the last day.