Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 23
Woe unto you, Scribes and Pharisees, hypocrites! for ye make clean the outside of the cup and of the platter, but within they are full of extortion and excess. Thou blind Pharisee, cleanse first that which is within the cup and platter, that the outside of them may be clean also.
This He speaks not of the cup and platter of sense, but of that of the understanding, which may be pure before God, though it have never touched water; but if it have sinned, then though the water of the whole ocean and of all rivers have washed it, it is foul and guilty before God.