1:18-20 The ministry is a warfare against sin and Satan; carried on under the Lord Jesus, who is the Captain of our salvation. The good hopes others have had of us, should stir us up to duty. And let us be upright in our conduct in all things. The design of the highest censures in the primitive church, was, to prevent further sin, and to reclaim the sinner. May all who are tempted to put away a good conscience, and to abuse the gospel, remember that this is the way to make shipwreck of faith also.

19. Holding—Keeping hold of "faith" and "good conscience" (1Ti 1:5); not "putting the latter away" as "some." Faith is like a very precious liquor; a good conscience is the clean, pure glass that contains it [Bengel]. The loss of good conscience entails the shipwreck of faith. Consciousness of sin (unrepented of and forgiven) kills the germ of faith in man [Wiesinger].

which—Greek singular, namely, "good conscience," not "faith" also; however, the result of putting away good conscience is, one loses faith also.

put away—a wilful act. They thrust it from them as a troublesome monitor. It reluctantly withdraws, extruded by force, when its owner is tired of its importunity, and is resolved to retain his sin at the cost of losing it. One cannot be on friendly terms with it and with sin at one and the same time.

made shipwreck—"with respect to THE faith." Faith is the vessel in which they had professedly embarked, of which "good conscience" is the anchor. The ancient Church often used this image, comparing the course of faith to navigation. The Greek does not imply that one having once had faith makes shipwreck of it, but that they who put away good conscience "make shipwreck with respect to THE faith."