Augustine of Hippo
Catena Aurea · Johannesevangelium 10
And it was at Jerusalem the feast of the dedication, and it was winter. And Jesus walked in the temple in Solomon’s porch. Then came the Jews round about him, and said unto him, How long dost thou make us to doubt? If thou be the Christ, tell us plainly, Jesus answered them, I told you, and ye believed not: the works that I do in my Father’s name, they bear witness of me. But ye believe not, because ye are not of my sheep, as I said unto you. My sheep hear my voice, and I know them, and they follow me. And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father’s hand. I and my Father are one.
(Tract. xxxvi. non occ.) Mark both those words, one and are, and thou wilt be delivered from Scylla and Charybdis. In that He says, one the Arian, in we are the Sabellian, is answered. There are both Father and Son. And if one, then there is no difference of persons between them.