Psychology must be a science of facts, not theories.

We don't inherit the earth from our ancestors; we borrow it from our children.

真正的快乐来自于内心的满足。

The true value of a forest cannot be measured in board feet alone.

I have noticed that youngsters given to the climbing habit usually do something when they grow up.

How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in your life you will have been all of these.