I think; therefore I am.

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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

I suppose therefore that all things I see are illusions; I believe that nothing has ever existed of everything my lying memory tells me. I think I have no senses. I believe that body, shape, extension, motion, location are functions. What is there then that can be taken as true? Perhaps only this one thing, that nothing at all is certain.

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Conquer yourself rather than the world.

Doubt is the origin of wisdom

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Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

It is not enough to have a good mind; the main thing is to use it well.

To know what people really think, pay attention to what they do, rather than what they say.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

Masked, I advance.