As long as you have a clear conscience, you can be a gentleman - open and at ease.
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From the Analects 《论语·述而》: 君子坦荡荡，小人长戚戚 (The gentleman is calm and broad; the petty person is always worried.) Contrasts the moral person's inner composure with the schemer's chronic anxiety.
usage
坦荡荡 = open, broad, relaxed - 荡 is reduplicated for emphasis and cadence. Usually quoted together with 小人长戚戚.
