The primary cause of unhappiness is never thesituation but your thoughts about it.

PID控制器是控制工程师的通用工具，适用于各种各样的过程。

程朱理学和陆王心学同属理学的范畴，他们都坚持天理是宇宙万物的本源，只是程朱理学认为天理独立于人体之外，若想找寻天理必须通过格物致知的方法才能有所成就，故程朱理学属于哲学派别中的客观唯心主义；而陆王心学则认为天理存在于人的内心深处必须通过反省自身，摒除欲望才能达到对天理的体悟，故属哲学派别中的主观唯心主义。

In mathematics, the journey from question to answer is often more enlightening than the answer itself.

I didn't start a business to make money, but to change the world.

The bond market is the ultimate measure of confidence.