“It is a common failing of mortals to deem the more difficult the fairer.”

I had become aware, as early as my college days, that no opinion, however absurd and incredible can be imagined, that has not been held by one of the philosophers.

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

Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.

Am I so tied to a body and senses that I am incapable of existing without them?

Each problem that I solved became a rule which served afterwards to solve other problems.

The first precept was never to accept a thing as true until I knew it as such without a single doubt

Masked, I advance.

There is nothing more ancient than the truth.

When it is not in our power to determine what it true, we ought to follow what is most probable.

For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than the increasing discovery of my own ignorance

All that is necessary to right action is right judgment, and to the best action the most correct judgment.

I desire to live in peace and to continue the life I have begun under the motto ‘to live well you must live unseen’.

Truths are more likely to have been discovered by one man than by nation

I doubt, therefore I think, therefore I am.

But what then am I? A thing that thinks. What is that? A thing that doubts, understand, affirms, denies, wills, refuses, and that also imagines and senses.

He who hid well, lived well.

Your birth may be common, But death must be history.

TEAMWORK: the fuel that allows common people attain uncommon results.

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 uncommon for people to spend their whole life waiting to start living.

Common sense ain’t common.

When men dream, each has his own world. When they are awake, they have a common world.

The truth of anything doesn’t matter anymore. What’s right doesn’t matter. What makes economic common sense doesn’t matter. I’m blue in the face over it.

Common sense is not so common.