"Whatever you do, don't ever use a crutch, and don't ever think of having an excuse for not having said, 'Yeah, I did my best.'"

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A perfect man would 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 is 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