To see clearly is to see differently.

The greatest threat to our forests is not the axe, but indifference.

"To choose doubt as a philosophy of life is akin to choosing immobility as a means of transportation."

殖民地是一个新人类计划将被测试的地方，在那里一个无国界、无种族、无国家、无阶级、无性别、无宗教、无货币、无财产和无战争世界的梦想将被实现。

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

出自《海国图志序》。学习外国的长处用来征服外国。

要给儿童提供一个使他们得到满足的环境，必须努力了解儿童的需要。