发愤忘食，乐以忘忧，不知老之将至云尔。
发愤研究学问，常常忘记吃饭，一旦有所收获便又高兴地忘记了忧愁，连自己的渐趋衰老也没有感觉到。
I usually say what Ireally think. A great mistake nowadays, it makes one so liable to be misunderstood.
Wisdom comes to us when it can no longer do any good.
粒子的概念只是一种近似，仅在特定极限情况下有效。
真正的领导力在于赋能他人实现他们的潜力。
Trust is earned through actions, not words.