1:13-16 As the traveller, the racer, the warrior, and the labourer, gathered in their long and loose garments, that they might be ready in their business, so let Christians do by their minds and affections. Be sober, be watchful against all spiritual dangers and enemies, and be temperate in all behaviour. Be sober-minded in opinion, as well as in practice, and humble in your judgment of yourselves. A strong and perfect trust in the grace of God, is agreeable with best endeavours in our duty. Holiness is the desire and duty of every Christian. It must be in all affairs, in every condition, and towards all people. We must especially watch and pray against the sins to which we are inclined. The written word of God is the surest rule of a Christian's life, and by this rule we are commanded to be holy every way. God makes those holy whom he saves.
13. Wherefore—Seeing that the prophets ministered unto you in these high Gospel privileges which they did not themselves fully share in, though "searching" into them, and seeing that even angels "desire to look into" them, how earnest you ought to be and watchful in respect to them!
gird up … loins—referring to Christ's own words, Lu 12:35; an image taken from the way in which the Israelites ate the passover with the loose outer robe girded up about the waist with a girdle, as ready for a journey. Workmen, pilgrims, runners, wrestlers, and warriors (all of whom are types of the Christians), so gird themselves up, both to shorten the garment so as not to impede motion, and to gird up the body itself so as to be braced for action. The believer is to have his mind (mental powers) collected and always ready for Christ's coming. "Gather in the strength of your spirit" [Hensler]. Sobriety, that is, spiritual self-restraint, lest one be overcome by the allurements of the world and of sense, and patient hopeful waiting for Christ's revelation, are the true ways of "girding up the loins of the mind."
to the end—rather, "perfectly," so that there may be nothing deficient in your hope, no casting away of your confidence. Still, there may be an allusion to the "end" mentioned in 1Pe 1:9. Hope so perfectly (Greek, "teleios") as to reach unto the end (telos) of your faith and hope, namely, "the grace that is being brought unto you in (so the Greek) the revelation of Christ." As grace shall then be perfected, so you ought to hope perfectly. "Hope" is repeated from 1Pe 1:3. The two appearances are but different stages of the ONE great revelation of Christ, comprising the New Testament from the beginning to the end.