The Qing painter and calligrapher Zheng Banqiao wrote four characters: 难得糊涂, “it is hard to be muddled.” Below them he added a note.
“Being clever is hard. Being muddled is harder still. Turning from cleverness to muddle is hardest of all. Let one move go, take a step back, and be at peace now. This is not for the sake of some later reward.”