3:10-13 The more fully we know the doctrine of Christ, as taught by the apostles, the more closely we shall cleave to it. When we know the afflictions of believers only in part, they tempt us to decline the cause for which they suffer. A form of godliness, a profession of Christian faith without a godly life, often is allowed to pass, while open profession of the truth as it is in Jesus, and resolute attention to the duties of godliness, stir up the scorn and enmity of the world. As good men, by the grace of God, grow better, so bad men, through the craft of Satan, and the power of their own corruptions, grow worse. The way of sin is down-hill; such go on from bad to worse, deceiving and being deceived. Those who deceive others, deceive themselves, as they will find at last, to their cost. The history of the outward church, awfully shows that the apostle spake this as he was moved by the Holy Ghost.

12. Yea, and—an additional consideration for Timothy: if he wishes to live godly in Christ, he must make up his mind to encounter persecution.

that will, &c.—Greek, "all whose will is to live," &c. So far should persecution be from being a stumbling-block to Timothy, he should consider it a mark of the pious. So the same Greek is used of the same thing, Lu 14:28, 33, "intending (Greek, 'wishing') to build a tower … counteth the cost."

live godly in Christ—(Ga 2:20; Php 1:21). There is no godliness (Greek, "piously") or piety out of Christ. The world easily puts up with the mask of a religion which depends on itself, but the piety which derives its vigor directly from Christ is as odious to modern Christians as it was to the ancient Jews [Bengel].

shall suffer persecution—and will not decline it (Ga 5:11). Bishop Pearson proves the divine origination of Christianity from its success being inexplicable on the supposition of its being of human origin. The nature of its doctrine was no way likely to command success: (1) it condemns all other religions, some established for ages; (2) it enjoins precepts ungrateful to flesh and blood, the mortifying of the flesh, the love of enemies, and the bearing of the cross; (3) it enforces these seemingly unreasonable precepts by promises seemingly incredible; not good things such as afford complacency to our senses, but such as cannot be obtained till after this life, and presuppose what then seemed impossible, the resurrection; (4) it predicts to its followers what would seem sure to keep most of the world from embracing it, persecutions.