“who by God’s power are being guarded through faith for a salvation ready to be revealed in the last time” (1 Peter 1:5).
God’s power, to be effective at all, must guard us from sin and unbelief. If his power plays no role in our faith, then it seems that his power accomplishes nothing in our making it to the end- since it is precisely unbelief and failure to hope in God that causes us to fall away from God. If God’s power does not protect us from unbelief, it is hard to see what it does. How is God protecting us until the end if his guarding plays no role in our continuing faith?
…God’s power protects us because his power is the means by which our faith is sustained.
~Schreiner & Caneday, The Race Set Before Us, 247,