Every part of the growing disciple’s life is connected with Jesus Christ. With a single word, “therefore,” this passage ties what is about to be said about the growing disciple with what had already been said about Christ. Peter started his letter to the persecuted church with assurance through the power and mercy of the Messiah (1:3-12).
1 Peter 1:13 calls the church to live seriously in Christ’s victory through transformed, worthy living.
1 Peter 1:13- 25 Therefore, with your minds ready for action, be serious and set your hope completely on the grace to be brought to you at the revelation of Jesus Christ. 14 As obedient children, do not be conformed to the desires of your former ignorance. 15 But as the One who called you is holy, you also are to be holy in all your conduct; 16 for it is written, Be holy, because I am holy.
Peter urged these struggling disciples to be self-disciplined by getting their minds ready for action.
Christian faith has never succeeded by being passive in the face of a cynical society. The grace of Christ never intended to release believers from active participation in His mission to this world. We are to be proactive by preparing our minds for action. Peter was not advocating mere positive thinking but the kind of mental preparedness that soldiers need for battle or athletes require for competition.