Or it signifies that God is incorporeal; and that therefore He ought to be worshipped not with the body, but with the soul, by the offering up a pure mind, i. e. that they who worship Him, must worship Him in spirit and in truth. The Jews neglected the soul, but paid great attention to the body, and had various kinds of purification. Our Lord seems here to refer to this, and to say, not by cleansing of the body, but by the incorporeal nature within us, i. e. the understanding, which He calls the spirit, that we must worship the incorporeal God.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. xxxii. 2