"One of the devices of Satan is to persuade the soul that repentance is an easy work. 'Why! Suppose you do sin,' says Satan, 'it is no difficult thing to return, confess, beg pardon and cry, 'Lord, have mercy upon me.' God will pardon your sin and save your soul.' But repentance is a mighty work, a difficult work, a work beyond our power. You may as well seek to melt adamant stone as to melt your own heart. Repentance is a flower that does not grow in nature's garden. It is not in the power of man to repent at leisure. Repentance is a turning from darkness to light. It effects the sinner's whole heart and life. It changes the heart from the power of sin unto God. Every sin strikes at the honor of God, the being of God, the glory of God, the heart of Christ, the joy of the Spirit, and the peace of a man's conscience. A truly penitent soul strikes at all sin, hates all, and will labor to crucify all…Repentance is also a turning to all good…Repentance sees sin's sinfulness, and how contrary it is to the blessed God."
- Thomas Brooks in Voices From the Past