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19 Having faith and a good conscience I understand the word faith to be a general term, denoting sound doctrine. In the same sense he afterwards speaks of “the mystery of faith.” (1 Timothy 3:9.) And, indeed, the chief things demanded from a teacher are these two: — that he shall hold by the pure truth of the gospel; and next, that he shall administer it with a good conscience and holiest zeal. Where these are found, all the others will follow of their own accord.

From which some having turned aside concerning faith He shows how necessary it is that faith be accompanied by a good conscience; because, on the other hand, the punishment of a bad conscience is turning aside from the path of duty. They who do not serve God with a sincere and a perfect heart, but give a loose rein to wicked dispositions, even though at first they had a sound understanding, come to lose it altogether.

This passage ought to be carefully observed. We know that the treasure of sound doctrine is invaluable, and therefore there is nothing that we ought to dread more than to have it taken from us. But Paul here informs us, that there is only one way of keeping it safe; and that is, to secure it by the locks and bars of a good conscience. This is what we experience every day; for how comes it that there are so many who, laying aside the gospel, rush into wicked sects, or become involved in monstrous errors? It is because, by this kind of blindness, God punishes hypocrisy; as, on the other hand, a genuine fear of God gives strength for perseverance.

Hence we may learn two lessons. First, Teachers and ministers of the gospel, and, through them all the churches are taught with what horror they ought to regard a hypocritical and deceitful profession of true doctrine, when they learn that it is so severely punished. Secondly, this passage removes the offense by which so many persons are greatly distressed, when they perceive that some, who formerly professed their attachment to Christ and to the gospel, not only fall back into their former superstitions but (which is far worse) are bewildered and captivated by monstrous errors. For by such examples, God openly supports the majesty of the gospel, and openly shows that he cannot at all endure the profanation of it. And this is what experience has taught us in every age. All the errors that have existed in the Christian Church from the beginning, proceeded from this source, that in some persons, ambition, and in others, covetousness, extinguished the true fear of God. A bad conscience is, therefore, the mother of all heresies; and we see that a vast number of persons, who had not sincerely and honestly embraced the faith, are hurried along, like brute beasts, into the reveries of the Epicureans, so that their hypocrisy is exposed. And not only so, but contempt of God is universally prevalent, and the licentious and disgraceful lives of almost all ranks show that there is either none at all, or the smallest possible potion of integrity in the world; so that there is very great reason to fear lest the light which had been kindled may be speedily extinguished, and God may leave the pure understanding of the gospel to be possessed by very few.

Have made shipwreck: The metaphor taken from shipwreck is highly appropriate; for it suggests to us, that, if we wish to arrive safely at the harbor, our course must be guided by a good conscience, otherwise there is danger of “shipwreck;” that is, there is danger lest faith be sunk by a bad conscience, as by a whirlpool in a stormy sea. ³⁰³⁰     “What is human life, and what is the whole of its course? A navigation. Not only are we travelers, as the Scripture tells us, (1 Peter 2:11,) but we have no solidity. They who travel by land, either on foot or on horseback, have still their sure and firm road; but in the world, instead of being on foot or on horseback, we must be, as it were, on a sea, and we have no solid footing. We are like people who are in a boat, and who are always within half a foot of their death; and the boat is a sort of grave, because they see the water all around ready to swallow them up. Thus is it with us, while we live here below. For, on the one hand, there is the frailty that is in us, which is more fluid than water; and then all that surrounds us is like water, which flows on all sides, while at every minute winds, and storms. and tempests arise. Let us therefore learn that our life is but a kind of navigation, which we perform by water, and that we are, at the same time, exposed to many winds and storms. And if it be so, what shall become of us when we have not a good boat or a good pilot?” — Fr. Ser.