Each success only buys an admission ticket to a more difficult problem.
A mathematician's work is never done; there are always new questions to explore and new mysteries to uncover.
每种心理状态都有其存在的目的;要理解它,我们必须询问它在更广泛的行为系统中发挥什么功能。
Forests are the lungs of the earth, and we must protect them with the same urgency as our own health.
Overfishing is a failure of management, not a failure of the ocean.
大脑是我们迄今为止在宇宙中发现的最复杂的东西。
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.