We have all about us in society today the very things we would logically expect to find with such natures as the Bible says we have, when left to develop without restraint. Man can do nothing to remedy the situation. A dozen different kinds of plants grow together in the same plot of ground, but each produces according to its nature. All life grows from the inside outward, and the only way to change the outside is to change first the inside. What we are at heart, what we are by nature, determines our thoughts, our actions, our character, our life.
Unregenerate man is wrong at heart.
He has a sinful nature, and he cannot change it and live righteously any more than the leopard can change his nature and get rid of his spots. And yet God requires a nature in man that will produce a righteous life. Again, God in His love comes to our rescue. Yes, just that. God is not in the reformation business.