There are two freedoms - the false, where a man is free to do what he likes; the true, where he is free to do what he ought.

孔子说：“我十五岁立志于学习，三十岁有所建树，四十岁不困惑，五十理解自然规律，六十明辨是非，七十随心所欲，不违规。”

When I look at the world I'm pessimistic, but when I look at people I am optimistic.

Human existence is a small yet unique manifestation in the cosmos; we should cherish and excel in our limited lives.”

解释：人不博览群书，不了解古今，不能识别世间事物，不知道是与非，就像盲人看不到颜色 、聋人听不到声音、鼻塞的人闻不到花香一样啊。