Repentance is always the companion of faith. They go hand in hand. Let no man speak evil of repentance. I have been grieved within my heart when I have heard some revivalists, by innuendo at the least, speak against repentance. You will never enter heaven without repentance; and if your faith do not lead you to hate sin, and do a great deal more than merely change your mind, as these modern fanatics say, you will find it is a faith which will never estrange you from the corruptions of the flesh, enamour you of the holiness of the Spirit, and conduct you to the heaven of God’s presence. You must hate sin; you must perceive the evil of it, and you must turn from it and live, according to the instincts of the divine life communicated, as well as according to the ordinances of the divine rule made known unto you, or else you are no child of God.
From a sermon by Charles Haddon Spurgeon entitled "A Personal Application," delivered January 16, 1870.