Theophylact of Ohrid
Catena Aurea · Lukasevangelium 18
And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others: Two men went up into the temple to pray; the one a Pharisee, and the other a Publican. The Pharisee stood and prayed thus with himself, God, I thank thee, that I am not as other men are, extortioners, unjust, adulterers, or even as this Publican. I fast twice in the week, I give tithes of all that I possess. And the Publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner. I tell you, this man went down to his house justified rather than the other: for every one that exalteth himself shall be abased; and he that humbleth himself shall be exalted.
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.