Augustine of Hippo

For just as we can strike and wound our own flesh whenever we wish, but seek a doctor to be healed, and we are not so healed by our own power as we are wounded by it, so the soul is sufficient for itself to sin, but implores God's healing right hand to heal what it has injured by sinning. Hence it says in another psalm: I said, O Lord, be merciful to me. Heal my soul, for I have sinned against You. To this, he adds: I said, O Lord, to show that the will and the choice to sin arise from the soul and are sufficient for it to destroy itself, but it belongs to God to seek what has perished and to save what has wounded itself. For the Son of Man came to seek and to save what was lost.