And this is the will of him that sent me, that everyone who sees the Son, and believes on him, may have everlasting life: and I will raise him up at the last day.
All Commentaries on John 6:40 Go To John 6
Cyril of Alexandria
AD 444
Having now defined the good Will of the Father, He makes it clear, and sets it forth more at large for the consideration of the hearers, through repeating it yet again. For what the mode of bringing is, and what any gain from being brought, He clearly explains. The Father then giveth to the Son Who hath Power to quicken them, things lacking life, He giveth thus, through knowledge inserting in each one, the true apprehension of the Son, and power to understand purely that He is God of Very God the Father, that he thus minded, and adorned with contemplations hereto belonging, may be brought to the reward of faith, that is a lasting and endless life in bliss. The Father then bringeth to the Son by knowledge and God-befitting Contemplation, those to whom He decreed the Divine grace. The Son receiveth and quickeneth them, and engrafting His Own Good into them who are of their own nature apt to decay, and shedding upon them as a spark of fire the life-giving Power of the Spirit, re-formeth them whole wholly unto immortality. But when thou hearest, that the Father brings them, and that the Son gives the power of living anew to them that run to Him, do not go off into absurd fancies, as though Each were supposed to do Individually and severally what belongs by fitness of Nature unto Each, but rather understand that the Father is Co-worker with the Son, and likewise the Son with the Father, and that our salvation and recovery from death to life is the Work (so to say) of the Whole Holy Trinity. And know that the Father is sufficient unto all might and need, and likewise the Son, and the Holy Ghost: but through the Whole Holy Trinity come the good things to usward, and God the Father is found all things in all Entirely through the Son in the Spirit.
We must nevertheless observe this also, that great is found to be the value of belief in the Son. For it hath life as its reward. But if God the Father is known in Him Who is Son by Nature, who will endure any longer them who exclude Him from the Essence of the Father, and have a mouth unbarred to blasphemy against Him? For wherein He says He can raise again to life that which has fallen into death, in these same words, without any distinction intervening, He mounts up to Identity of Nature with the Father. For quickening is a work proper to life, and since the Father is by Nature Life, Life surely will He too be conceived Who is of Him by Nature, i. e., the Only-Begotten.