The Foolish Trouble Themselves
天下本无事,庸人自扰之
tiānxià běn wúshì, yōngrén zì rǎo zhī
A Tang official refused to have a clerk beaten, and remarked that the world makes no trouble on its own. Twelve hundred years later the sentence counsels private calm — after one character slipped in and moved the trouble from the office into the head.