Sad people dislike the happy, and the happy the sad the quick thinking the sedate, and the careless the busy and industrious

A boaster and a liar are cousins

Man should think like few do and talk like the many others

When policy fails try thinking

Men should strive to think much and know little

Thinking is only a process of talking to yourself

No doubt another may also think for me but it is not therefore desirable that he should do so to the exclusion of my thinking for myself

Think of the going-out before you enter

There are people who think that they are thinking. But that is all they are thinking

Great thoughts come from the heart