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.
True growth comes from balancing short-term gains with long-term vision.
The best performance improvement is the transition from the nonworking state to the working state.
We all have multiple identities - the trick is to embrace them all.
这是最好的时代，也是最坏的时代；这是智慧的时代，也是愚蠢的时代；这是信仰的时代，也是怀疑的时代；这是光明的季节，也是黑暗的季节；这是希望的春天，也是绝望的冬天；我们什么都有，也什么都没有；我们正走向天堂之路，也正走向地狱之门。