Catena Aurea on John 16:23–28: Hilary of Poitiers

Perfect faith in the Son, which believes and loves what has come forth from God, and deserveth to be heard and loved for its own sake, this faith confessing the Son of God, born from Him, and sent by Him, needeth not an intercessor with the Father: wherefore it follows, And have believed that I came forth from God. His nativity and advent are signified by, I came forth from the Father, and am come into the world. The one is dispensation, the other nature. To have come from the Father, and to have come forth from God, have not the same meaning; because it is one thing to have come forth from God in the relation of Sonship1, another thing to have come from the Father into this world to accomplish the mystery2 of our salvation. Since to come forth from God is to subsist as His Son3, what else can He be but God.