悲观主义者在每个机会里看到困难。乐观主义者在每个困难里看到机会。

"Life is a series of natural and spontaneous changes. Don't resist them; that only creates sorrow. Let reality be reality. Let things flow naturally forward in whatever way they like."

Thinking is behavior. The muscular habits learned in overt speech are responsible for implicit or internal speech (thought).