Hilary of Poitiers
Catena Aurea · Johannesevangelium 14
Philip saith unto him, Lord, shew us the Father, and it sufficeth us. Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father? Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I am in the Father, and the Father in me: or else believe me for the very works’ sake.
(vii. de Trin) But the Father is in the Son, and the Son in the Father, not by a conjunction of two harmonizing essences3, nor by a nature grafted into a more capacious substance as in material bodies, in which it is impossible that what is within can be made external to that which contains it; but by the birth of a nature which is life from life; forasmuch as from God nothing but God can be born.