To an inheritance incorruptible, and undefiled, and that fadeth not away, reserved in heaven for you, Who are kept by the power of God through faith unto salvation ready to be revealed in the last time. – 1 Peter 1:4,5

“Reserved in heaven for you who are kept by the power of God through faith unto salvation;” This perhaps will be one of the greatest cordials to a Christian in heaviness, that he is not kept by his own power, but by the power of God, and that he is not left in his own keeping, but he is kept by the Most High. Ah! what should you and I do in the day when darkness gathers round our faith, if we had to keep ourselves!…I know that He hath said, “I give unto My sheep eternal life, and they shall never perish, neither shall any man pluck them out of my hand.” What, Lord, but suppose they should grow faint-that they should begin to murmur in their affliction. Shall they not perish then? No, they shall never perish. But suppose the pain should grow so hot that their faith should fail: shall they not perish then? No, “they shall not perish, neither shall any man pluck them out of My hand.” But suppose their sense should seem to wander, and some should try to pervert them from the faith: shall they not be perverted? No; “they shall never perish,” But suppose in some hour of their extremity hell and the world and their own fears should all beset them, and they should have no power to stand-no power whatever to resist the fierce onslaughts of the enemy, shall they not perish then? No, they are “kept by the power of God through faith unto salvation, ready to be revealed,” and they shall never perish, neither shall any man pluck them out of My hand.” Ah! this is the doctrine, the cheering assurance “wherein we greatly rejoice, though now for a season, if needs be, we are in heaviness through manifold temptations.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0222.cfm