because everyone who has been fathered by God conquers the world. This is the conquering power that has conquered the world: our faith.
[1 John 5:4 NET]
If we are to be saved our faith must gain the day; we must have a faith that shall triumph over death and hell and gain a glorious conquest over every internal and external and infernal foe. This is just the state, then, in which the matter stands—we must either conquer or be conquered; we must either gain the day and be crowned with an immortal crown of glory, or else sink in the strife, defeated by sin and Satan. But none of God’s people will be defeated in the fight; and yet they often seem, as it were, to escape defeat by the very skin of their teeth; yet faith will sooner or later gain the day, for Jesus is its finisher as well as its author. He will crown the faith of his own gift with eternal glory. He will never allow his dear family to be overcome in the good fight of faith, for he will give strength to every weak arm and power to every feeble knee, and has engaged to bring them off more than conquerors.
Thus as the Lord the Spirit is pleased to work in the soul by his living energy, he strengthens faith more and more to believe in the name of the only begotten Son of God, to receive more continual supplies out of his fullness, to wrestle more earnestly with God for a spiritual blessing, to stand more firmly in the evil day against every assaulting foe, to fight more strenuously the good fight of faith, and never cry defeat until faith gains its glorious end, which is to see Jesus as he is in the realms of eternal day.