"True religion, then, is not an external service ; nor is it a mere excitement of fear and sorrow succeeded by peace and joy ; nor is it a fitful alternation of such exercises. It is a permanent principle of action, spontaneous in its exercises and progressive in its nature. These attributes, are essential to its genuineness, but they do not constitute its whole character. It is a participation of the divine nature, or the conformity of the soul to God. It is described as the putting off the old man with his deeds and putting on the new man, which is renewed in knowledge after the image of him that created him or a being renewed in the spirit of our mind, that we may put on the new man, which after God is created in righteousness and true holiness. "
--The Way of Life, Charles Hodge, Chapter 9, Holy Living