We will have no other master but our caprice -- that is to say, our evil self will have no God, and the foundation of our nature is seditious, impious, refractory, opposed to and contemptuous of all that tries to rule it, and therefore contrary to order, ungovernable and negative. It is this foundation which Christianity calls the natural man. But the savage which is within us, and constitutes the primitive stuff of us, must be disciplined and civilized in order to produce a man. And the man must be patiently cultivated to produce a wise man; and the wise man must be tested and tried if he is to become righteous, and the righteous man must have substituted the will of God for his individual will, if he is to become a saint.
— Henri-frédéric Amiel
Christianity