24 What, however, does the Lord teach the woman now, as one whose husband has begun to be present? “The woman says unto Him, Sir, I perceive that you are a prophet. Our fathers worshipped in this mountain; and you say that in Jerusalem is the place where men ought to worship. Jesus says unto her, Woman, believe me.” For the Church will come, as it is said in the Song of Songs, “will come, and will pass over from the beginning of faith.” She will come in order to pass through; and pass through she cannot, except from the beginning of faith.
Rightly she now hears, the husband being present: “Woman, believe me.” For there is that in you now which can believe, since your husband is present. You have begun to be present with the understanding when you called me a prophet. Woman, believe me; for if you believe not, you will not understand. Therefore, “Woman, believe me, for the hour will come when you shall neither in this mountain nor in Jerusalem worship the Father. You worship ye know not what: we worship what we know; for salvation is of the Jews.
But the hour will come.” When? “And now is.” Well, what hour? “When the true worshippers shall worship the Father in spirit and in truth,” not in this mountain, not in the temple, but in spirit and in truth. “For the Father seeks such to worship Him.” Why does the Father seek such to worship Him, not on a mountain, not in the temple, but in spirit and in truth? “God is Spirit.” If God were body, it were right that He should be worshipped on a mountain, for a mountain is corporeal; it were right He should be worshipped in the temple, for a temple is corporeal. “God is Spirit; and they that worship Him, must worship in spirit and in truth.”
Source: Tractates on the Gospel of John (New Advent)