《鬼谷子·鬼谷子·反应》
若要了解外界的人或事物，最好的方法就是从了解自己开始。只有先了解自己，然后才能够去了解别人。
故知之始己，自知而后知人也。
If you want to understand people or things outside, the best way is to start by understanding yourself. Only after you know yourself can you go to understand others.