Hilary of Poitiers
Catena Aurea · Johannesevangelium 5
Verily, verily, I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God: and they that hear shall live. For as the Father hath life in himself; so hath he given to the Son to have life in himself.
The heretics, driven hard by Scripture proofs, are obliged to attribute to the Son at any rate a likeness, in respect of virtue, to the Father. But they do not admit a likeness of nature, not being able to see that a likeness of virtue, could not arise but from a likeness of nature; as an inferior nature can never attain to the virtue of a higher and better one. And it cannot be denied that the Son of God has the same virtue with the Father, when He says, What things soever (the Father) doeth, the same doeth the Son likewise. But an express mention of the likeness of nature follows: As the Father hath life in Himself, so hath He given to the Son to have life in Himself. In life are comprehended nature and essence. And the Son, as He hath it, so hath He it given to Him. For the same which is life in both, is essence in both; and the life, i. e. essence, which is begotten from life, is born; though not born unlike the other. For, being life from life, it remains like in nature to its origin.