好人何必自取其辱坏人不必装作痛苦
[hăo rén hé bì zì qŭ qí rŭ huài rén bù bì zhuāng zuò tòng kŭ]
'A good man doesn't need to humiliate himself; a bad person needn't pretend to be tormented.' It expresses a thought that people should stay true to their genuine nature without putting unnecessary emotional masks on.