Believest thou not that I am in the Father?.... This surely is, as it must needs be, and ought to be, an article of your faith, "that I am in the Father",and the Father in me; phrases which are expressive of the sameness of nature in the Father and the Son; of the Son's perfect equality with the Father, since the Son is as much in the Father, as the Father is in the Son; and also of the personal distinction there is between them; for nothing with propriety can be said to be in itself.
The Father must be distinct from the Son who is in him, and the Son must be distinct from the Father, in whom he is; the Father and Son, though of one and the same nature, cannot be one, and the same person:the words that I speak unto you, I speak not of myself.