Hilary of Poitiers
Catena Aurea · Johannesevangelium 4
The woman saith unto him, Sir, I perceive that thou art a prophet. Our fathers worshipped in this mountain; and ye say, that in Jerusalem is the place where men ought to worship. Jesus saith unto her, Woman, believe me, the hour cometh, when ye shall neither in this mountain, nor yet at Jerusalem, worship the Father. Ye worship ye know not what: we know what we worship: for salvation is of the Jews. But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him. God is a Spirit: and they that worship him must worship him in spirit and in truth.
(ii. de Trin. c. 31) Or, by saying that God being a Spirit ought to be worshipped in spirit, He indicates the freedom and knowledge of the worshippers, and the uncircumscribed nature of the worship: according to the saying of the Apostle, Where the Spirit of the Lord is, there is liberty. (2 Cor. 3:17)