知足者常乐。快乐很难去衡量，但是有证据表明美国人不管收入。财富、教育等等如何，他们对他们的环境很满足。
General happiness. Happiness is difficult to measure, but there is evidence that Americans are by and large satisfied with their circumstances regardless of income, wealth, education, etc.
只有那份淡定，也就是俗话说的——知足者常乐，才能使我们真正的保持快乐的心态和生活！
Only a share of Dan Ding, that is, the saying goes can we truly maintain a happy state of mind and life!
也知道了只有三种人才能真正快乐，单纯者常乐，知足者常乐，无知者常乐。
Only by knowing that can but only three types of person be happy: the pure the content and innocent.
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