We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.

自由民主的传播和世界经济的整合创造了一种情况，即唯一合法的政府形式是基于人民主权并尊重基本人权的政府。

The forest is a teacher—if we are willing to learn.

The teacher's task is not to implant facts but to place the subject to be learned in front of the learner and, through sympathy, emotion, imagination, and patience, to awaken in the learner the restless drive for answers and insights which enlarge the personal life.

The iron rule of nature is: you get what you reward for. If you want ants to come, you put sugar on the floor.

"A writer's duty is to tell the truth, no matter how painful."

我不介意你思考得慢；我介意你发表得比思考快。