There is in the inner person a kind of daily quarrel; a praiseworthy battle acts to keep what is better from being overcome by what is worse. The struggle is to keep desire from conquering the mind and to keep lust from conquering wisdom. The better part in you…is that part in which God’s image is found. This is called the mind, the intellect. There faith burns, there hope is strengthened, there charity is kindled.

—Augustine, Sermon 53A.12