Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 18:9-14

“It becomes us not only to shun evil, but also to do good; and so after having said, I am not as other men are, extortioners, unjust, adulterers, he adds something by way of contrast, I fast twice in a week. They called the week the Sabbath, (Sabbatho) from the last day of rest. The Pharisees fasted upon the second and fifth day. He therefore set fasting against the passion of adultery, for lust is born of luxury; but to the extortioners and usurists he opposed the payment of tithes; as it follows, I give tithes of all I possess; as if he says, So far am I from indulging in extortion or injuring, that I even give up what is my own.”