Thomas Aquinas

After this he explains: so you also outwardly indeed appear to men just, i.e., men judge you to be just, but inwardly you are full of hypocrisy and iniquity. He comprehends the carnal sins, avarice and gluttony, as was said above, under which vainglory is contained; John 12:43: they loved their own glory more than the glory of God. Likewise, under iniquity, all spiritual sins.

Commentary on Matthew ↗