成人必须给幼儿提供活动的空间。

对心灵的研究就是对生活问题解决的研究。

翻译：指出世间万物皆有可能被人类利用，但工艺的精巧和细微之处仍需不断追求。

Growth is painful, but nothing is as painful as staying stuck.

幽默是应对生活荒谬的一种方式。

工会对工资和就业的影响常常被误解。

Man is not logical and his intellectual history is a record of mental reserves and compromises. He hangs on to what he can in his old beliefs even when he is compelled to surrender their logical basis.