Every act of will is an act of self-limitation. To desire action is to desire limitation. In that sense every act is an act of self-sacrifice. When you choose anything, you reject everything else. That objection, which men of this school used to make to the act of marriage, is really an objection to every act. Every act is an irrevocable selection and exclusion. Just as when you marry one woman you give up all the others, so when you take one course of action you give up all the other courses.

G.K. Chesterton