True wisdom is in knowing one's own ignorance.
一个人的伟大不在于他获得了多少财富，而在于他的正直和他积极影响周围人的能力。
科学是现实的诗歌。
Every tree planted today is a promise to tomorrow.
种一棵树最好的时间是20年前，其次是现在。
"Children's literature is the foundation of the imagination, the birthplace of creativity, and the first step towards a lifelong love of reading."
心理学家必须是一个冷静的观察者。