3:10-15 The apostle was a wise master-builder; but the grace of God made him such. Spiritual pride is abominable; it is using the greatest favours of God, to feed our own vanity, and make idols of ourselves. But let every man take heed; there may be bad building on a good foundation. Nothing must be laid upon it, but what the foundation will bear, and what is of a piece with it. Let us not dare to join a merely human or a carnal life with a Divine faith, the corruption of sin with the profession of Christianity. Christ is a firm, abiding, and immovable Rock of ages, every way able to bear all the weight that God himself or the sinner can lay upon him; neither is there salvation in any other. Leave out the doctrine of his atonement, and there is no foundation for our hopes. But of those who rest on this foundation, there are two sorts. Some hold nothing but the truth as it is in Jesus, and preach nothing else. Others build on the good foundation what will not abide the test, when the day of trail comes. We may be mistaken in ourselves and others; but there is a day coming that will show our actions in the true light, without covering or disguise. Those who spread true and pure religion in all its branches, and whose work will abide in the great day, shall receive a reward. And how great! how much exceeding their deserts! There are others, whose corrupt opinions and doctrines, or vain inventions and usages in the worship of God, shall be made known, disowned, and rejected, in that day. This is plainly meant of a figurative fire, not of a real one; for what real fire can consume religious rites or doctrines? And it is to try every man's works, those of Paul and Apollos, as well as others. Let us consider the tendency of our undertakings, compare them with God's word, and judge ourselves, that we be not judged of the Lord.

12. Now—rather, "But." The image is that of a building on a solid foundation, and partly composed of durable and precious, partly of perishable, materials. The "gold, silver, precious stones," which all can withstand fire (Re 21:18, 19), are teachings that will stand the fiery test of judgment; "wood, hay, stubble," are those which cannot stand it; not positive heresy, for that would destroy the foundation, but teaching mixed up with human philosophy and Judaism, curious rather than useful. Besides the teachings, the superstructure represents also the persons cemented to the Church by them, the reality of whose conversion, through the teachers' instrumentality, will be tested at the last day. Where there is the least grain of real gold of faith, it shall never be lost (1Pe 1:7; compare 1Co 4:12). On the other hand, the lightest straw feeds the fire [Bengel] (Mt 5:19).