“I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.”

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.

Bad books engender bad habits, but bad habits engender good books.

Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.

Nothing is made from nothing.

To think? That’s it. It is thought. This alone cannot be detached from me. I am, I exist; that is certain.

Divide each difficulty into as many parts as is feasible and necessary to resolve it.

To live well is to live concealed.

It is best not to go on for great quest for truth , it will only make you miserable

The dreams we imagine when we are asleep should not in any way make us doubt the truth of the thoughts we have when we are awake.

The destruction of the foundations necessarily brings down the whole edifice.

For to be possessed of a vigorous mind is not enough; the prime requisite is rightly to apply it.

For the very fact that my knowledge is increasing little by little is the most certain argument for its imperfection.

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

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.

Never chain your dogs together with sausages. One must accustom one’s self to be bored.

The man to solitude accustom’d long, Perceives in everything that lives a tongue; Not animals alone, but shrubs and trees Have speech for him, and understood with ease,

Our species in general had grown accustomed to pain and adversity through millennia of struggle, we were only recently evolving the ability to let ourselves feel good and have things go well for any significant period of time.

But the division in him was a sorrow and a torment, and he became accustomed to it only as one gets used to an unhealed and frequently reopened wound.

The people generally get accustomed to the established order of things and begin to tremble at the very idea of a change. It is this lethargical spirit that needs be replaced by the revolutionary spirit.

Probably the undertaker thinks less of death than almost any other man. He is so accustomed to it that his mind must involuntarily turn from its horror to a contemplation of how much he makes out of the burial.