I fast twice in the week, I give tithes of all that I possess. I give tithes of all that I possess - Or, of all I acquire, κτωμαι.
Raphelius has well observed, that this verb, in the present tense, signifies to acquire - in the preter, to possess: the Pharisee's meaning seems to be, "As fast as I gain any thing, I give the tenth part of it to the house of God and to the poor." Those who dedicate a certain part of their earnings to the Lord should never let it rest with themselves, lest possession should produce covetousness. This was the Pharisee's righteousness, and the ground on which he builded his hope of final salvation. That the Pharisees had a strong opinion of their own righteousness, the following history will prove: -
"Rabbi Simeon, the son of Jochai, said: The whole world is not worth thirty righteous persons, such as our father Abraham. If there were only thirty righteous persons in the world, I and my son should make two of them; but if there were but twenty, I and my son would be of the number; and if there were but ten, I and my son would be of the number: and if there were but five, I and my son would be of the five; and if there were but two, I and my son would be those two; and if there were but one, myself should be that one." Bereshith Rabba, s. 35, fol. 34. This is a genuine specimen of Pharisaic pride. No wonder that our Lord accused these of pride and vain glory: they were far from humility, and consequently far from righteousness.