I believe there's no proverb but what is true they are all so many sentences and maxims drawn from experience the universal mother of sciences.

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We say no to lots of things that would please us. I would like to punch people every now and then but I don't. I would like to have something for free rather than pay for it. I would like to skip to the front of the line... I don't mean to brush aside the taste of meat which is a powerful attraction. But its power is not without limit.