holding faith and a good conscience; which some having thrust away made a shipwreck concerning the faith;
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. 