"Repentance was never yet produced in any man's heart apart from the grace of God. As soon may you expect the leopard to regret the blood with which its fangs are moistened,—as soon might you expect the lion of the wood to abjure his cruel tyranny over the feeble beasts of the plain, as expect the sinner to make any confession, or offer any repentance that shall be accepted of God, unless grace shall first renew the heart."