"A perfect man w[oul]d never act from a sense of duty; he'd always want the right thing more than the wrong one. Duty is only a substitute for love (of God and of other people), like a crutch, which is a substitute for a leg. Most of us need the crutch at times; but of course it's idiotic to use the crutch when our own legs (our own loves, tastes, habits etc) can do the journey on their own!"- C. S. Lewis
Source: Lewis, C. S. Letters to Children. 1st Touchstone ed. New York, NY: Touchstone, 1995. 72. Print.