Let us notice, however, the purpose of this testing of prophecy. Despise not such utterances, the Apostle says, but prove all: hold fast that which is good, and hold off from every evil kind. There is a curious circumstance connected with these short verses. Many of the fathers of the Church connect them with what they consider a saying of Jesus, one of the few which is reasonably attested, though it has failed to find a place in the written gospels. The saying is, "Show yourselves approved money-changers." The fathers believed, and on such a point they were likely to be better judges than we, that in the verses before us the Apostle uses a metaphor from coinage. To prove is really to assay, to put to the test as a banker tests a piece of money; the word rendered "good" is often the equivalent of our sterling; "evil," of our base or forged; and the word which in our old Bibles is rendered "appearance"--"Abstain from all appearance of evil"--and in the Revised Version "form"--"Abstain from every form of evil"--has, at least in some connections, the signification of mint or die. If we bring out this faded metaphor in its original freshness, it will run something like this: Show yourselves skilful money-changers; do not accept in blind trust all the spiritual currency which you find in circulation; put it all to the test; rub it on the touchstone; keep hold of what is genuine and of sterling value, but every spurious coin decline. Whether the metaphor is in the text or not,--and in spite of a great preponderance of learned names against it, I feel almost certain it is,--it will help to fix the Apostle's exhortation in our memories. There is no scarcity, at this moment, of spiritual currency. We are deluged with books and spoken words about Christ and the gospel. It is idle and unprofitable, nay, it is positively pernicious, to open our minds promiscuously to them; to give equal and impartial lodgment to them all. There is a distinction to be made between the true and the false, between the sterling and the spurious; and till we put ourselves to the trouble to make that distinction, we are not likely to advance very far. How would a man get on in business who could not tell good money from bad? And how is any one to grow in the Christian life whose mind and conscience are not earnestly put to it to distinguish between what is in reality Christian and what is not, and to hold to the one and reject the other? A critic of sermons is apt to forget the practical purpose of the discernment here spoken of. He is apt to think it his function to pick holes. "Oh," he says, "such and such a statement is utterly misleading: the preacher was simply in the air; he did not know what he was talking about." Very possibly; and if you have found out such an unsound idea in the sermon, be brotherly, and let the preacher know. But do not forget the first and main purpose of spiritual judgment--hold fast that which is good. God