They who have true love to God love him so as wholly to devote themselves to God. This we are taught in the sum of the Ten Commandments: “Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength” (Mark 12:30). Here is contained in these words a description of a right love to God; and they teach us that they who love him aright do devote all to him, all their hearts, and all their souls, all their mind and all their strength, or all their powers and faculties. Surely, a man who gives all this wholly to God keeps nothing back, but devotes himself wholly and entirely to God. He who gives God all his heart, and all his soul, and all his mind, and all his powers or strength, keeps nothing back; there is no room for any reserve. All who have true love to God have a spirit thus to do. This shows how much a principle of true love to God is above a selfish principle. For if self be devoted wholly to God, then there is something above self which influences the man; there is something superior to self which takes self and makes an offering of it to God. A selfish principle never devotes self to another; the nature of it is to devote all others to self. They who have true love to God, love God as God, and as the supreme good; whereas the nature of selfishness is to set up self for God, to make an idol of self. That being which men respect as God, they devote all to. They who idolize self devote all to self, but they who love God as God devote all to him.
Ethical Writings, WJE (Yale University Press, 1989), 264–265.