Catena Aurea on John 16:12–15: Didymus the Blind

As if He said, Although the Spirit of truth proceeds from the Father, yet all things that the Father hath are Mine, and even the Spirit of the Father is Mine, and receiveth of Mine. But beware, when thou hearest this, that thou think not it is a thing or possession which the Father and the Son have. That which the Father hath according to His substance, i. e. His eternity, immutability, goodness, it is this which the Son hath also. Away with the cavils of logicians, who say, therefore the Father is the Son. Had He said indeed, All that God hath are Mine, impiety might have taken occasion to raise its head; but when He saith, All things that the Father hath are Mine, by using the name of the Father, He declareth Himself the Son, and being the Son, He usurpeth not the Paternity, though by the grace of adoption He is the Father of many saints.