2 Timothy 2:1

The young sailor at sea is inspired with great confidence, if the Master of the ship has been preserved in a shipwreck. For he will not consider that it is from his inexperience that he is exposed to the storm, but from the nature of things; and this has no little effect upon his mind. In war also the Captain, who sees his General wounded and recovered again, is much encouraged. And thus it produces some consolation to the faithful, that the Apostle should have been exposed to great sufferings, and not rendered weak by the utmost of them. And had it not been so, he would not have related his sufferings. For when Timothy heard, that he who possessed so great powers, who had conquered the whole world, is a prisoner, and afflicted, yet is not impatient, nor discontented upon the desertion of his friends; he, if ever exposed to the same sufferings himself, would not consider that it proceeded from human weakness, nor from the circumstance of his being a disciple, and inferior to Paul, since his teacher too suffered the like, but that all this happened from the natural course of things. For Paul himself did this, and related what had befallen him, that he might strengthen Timothy, and renew his courage. And he shows that it was for this reason he mentioned his trials and afflictions, in that he has added, "Thou, therefore, my son, be strong in the grace that is in Christ Jesus." What sayest thou? Thou hast shaken us with terrors, thou hast told us that thou art in chains, in afflictions, that all have forsaken thee, and, as if thou hadst said thou hadst not suffered anything, nor been abandoned by any, thou addest, "Thou therefore, my son, be strong"?-And justly too. For these things were to thy strengthening more than to his. For if I, Paul, endure these things, much more oughtest thou to bear them. If the master, much more the disciple. And this exhortation he introduces with much affection, calling him "son," and not only so, but "my son." If thou art a son, he means, imitate thy father. If thou art a son, be strong in consideration of the things which I have said, or rather be strong, not merely from what I have told you, but "of God." "Be strong," he says, "in the grace that is in Christ Jesus"; that is, "through the grace of Christ." That is, stand firmly. Thou knowest the battle. For elsewhere he says, "We wrestle not against flesh and blood." (Eph. vi. 12.) And this he says not to depress but to excite them. Be sober therefore, he means, and watch have the grace of the Lord cooperating with thee, and aiding thee in thy contest, contribute thy own part with much alacrity and resolution.