如果你无法简单地解释它,说明你理解得还不够透彻。
If you can't explain it simply, you don't understand it well enough.
Whereof one cannot speak, thereof one must be silent.
I'm a big believer in 'to each his own.'
叶公问子路:孔子是怎样的人,子路不回答。孔子说:“你怎么不说:他这个人啊,发愤学习就忘记吃饭,高兴起来就忘记了忧愁,不知道快要变老了等等?”