Judge a man by his questions rather than by his answers.

Think for yourself and let others enjoy the privilege of doing so too.

Men use thought only as authority for their injustice, and employ speech only to conceal their thoughts.

I do not know by what power I think; but well I know that I should never have thought without the assistance of my senses. That there are immaterial and intelligent substances I do not at all doubt; but that it is impossible for God to communicate the faculty of thinking to matter, I doubt very much. I revere the Eternal Power, to which it would ill become me to prescribe bounds. I affirm nothing, and am contented to believe that many things are possible than are usually thought so".

The greatest consolation in life is to say what one thinks.

How I like the boldness of the English, how I like the people who say what they think!

We only half live when we only half think.

Our character is composed of our ideas and our feelings: and, since it has been proved that we give ourselves neither feelings nor ideas, our character does not depend on us. If it did depend on us, there is nobody who would not be perfect. If one does not reflect, one thinks oneself master of everything; but when one does reflect, one realizes that one is master of nothing

He who thinks himself wise, O heavens! is a great fool.