正如几何学最自然的起点是数学点，在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.
A wise man said， “Before you speak， let your words pass through three gates. At the first gate， ask yourself， “Is it true？” At the second gate ask， “Is it necessary？” At the third gate ask， “Is it kind？”
The only limit to our realization of tomorrow will be our doubts of today.
我的作品纯粹是自传性的...它关于我自己和我的周围环境。
Collaboration is key in modern research—no single mind can solve the grand challenges alone.