Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.
—Romans 12:2

Of this transformation, which Paul styles a renovation of the mind, though it is the first entrance into life, all the philosophers were ignorant. For they set up reason as the sole directress of man, they think that she is exclusively to be attended to, in short to her alone they assign the government of the conduct; but the Christian philosophy commands her to give place, and submit to the Holy Spirit; so that now the man himself lives not, but carries about Christ living and reigning within him.

—John Calvin
Institutes of the Christian Religion, 2:166.