#中华传统美德##经晨一语# 
【原文】言而必信，期而必当，天下之高行也。（《淮南子·氾论训》）
【解读】说话一定要讲信用，约定了就一定要遵守承诺，这是天下的高尚行为。
【译文】To keep one's promise and appointment at any cost is a refined behavior admired by people of the world.(quoted from a Compendious Essay, Huai Nan Zi)