Repent ye therefore, and be converted, that your sins may be blotted out… – Acts 3:19

Some of our Hyper-Calvinist friends have said that the repentance to which men are here exhorted is but an outward repentance. Does a merely outward repentance bring with it the blotting out of sin? Assuredly not. The repentance to which men are here exhorted is a repentance which brings with it complete pardon-“that your sins may be blotted out.” And, moreover, it seems to me to be a shocking thing to suppose that Peter and John went about preaching up a hollow, outward repentance, which would not save men…Brethren, it was a soul-saving repentance, and nothing less than that, which Peter commanded of these men. We tell men to repent and believe, not because we rely on any power in them to do so, for we know them to be dead in trespasses and sins; not because we depend upon any power in our earnestness or in our speech to make them do so, for we understand that our preaching is less than nothing apart from God; but because the gospel is the mysterious engine by which God converts the hearts of men, and we find that, if we speak in faith, God the Holy Ghost operates with us, and while we bid the dry bones live, the Spirit makes them live; while we tell the lame man to stand on his feet, the mysterious energy makes his ankle-bones to receive strength; while we tell the impotent man to stretch out his hand, a divine power goes with the command, and the hand is stretched out and the man is restored. The power lies not in the sinner, not in the preacher, but in the Holy Spirit, which works effectually with the gospel by divine decree, so that where the truth is preached the elect of God are quickened by it, souls are saved, and God is glorified. God has promised to make His gospel the power to save, and so it shall be down to the world’s end. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0804.cfm