Exposition on the Psalms of David
But how do you know that you are innocent? "Prove me, O Lord," you know this. And he sets forth three things: namely, proof, tribulation, and temptation. The second follows from the first, the third from the second. He says, therefore, "O Lord, prove me," not so that you may learn something about me from this, but so that you may show it to others. A person is best proved through temptation, which is the taking of experience: temptation is the receiving of experience about what one does not know; proof, however, is the manifestation of virtue about what one does know. And therefore he says, "Try me," namely for this purpose, that I may appear tested to myself and to others: for God does not tempt to evil: Jas. 1: "God is not a tempter of evils"; but he is said to tempt when certain things are shown through immense difficulty. This temptation, moreover, is done through fire, as it is said in Wis. 3: "As gold in the furnace he has tried them." And therefore he says, "Burn my loins and my heart," that is, send tribulations, through which it may be clear what is in my heart and loins. To the heart is attributed thought, to the loins pleasure. And this appears through tribulations; because those who delight in earthly things are greatly disturbed when they lose them, but not those who do not delight in them. Or it can be referred to the fire of the Holy Spirit: Lk. 12: "I have come to cast fire upon the earth": as if to say, lest I fail in tribulations, apply your help, send the fire which may burn away whatever is carnal in my pleasures and whatever is vain in my thoughts.
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