现实是心灵的建构。

Every child should have mud pies, grasshoppers, water bugs, tadpoles, frogs, mud turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb, brooks to wade in, water lilies, woodchucks, bats, bees, butterflies, various animals to pet, hayfields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets; and any child who has been deprived of these has been deprived of the best part of education.

我不让任何人定义我。

Every scientific discovery should be measured by its contribution to human welfare.

天下不怕没有能臣，怕的是没有君主去使用他们；天下不怕没有财货，怕的是无人去管理它们。