A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

No matter how much suffering you went through, you never wanted to let go of those memories.

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

Appearances often are deceiving.

The ultimate authority must always rest with the individual's own reason and critical analysis.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.

I don't know, I don't care, and it doesn't make any difference.

Tomorrow hopes we have learned something from yesterday.

Property is surely a right of mankind as real as liberty.

Simplicity is the ultimate sophistication.

Real knowledge is to know the extent of one's ignorance.

Drop the idea that you are Atlas carrying the world on your shoulders. The world would go on even without you. Don't take yourself so seriously.

Reflect upon your present blessings, of which every man has many; not on your past misfortunes, of which all men have some.

I believe that one defines oneself by reinvention. To not be like your parents. To not be like your friends. To be yourself. To cut yourself out of stone.

A house divided against itself cannot stand.

Attachment is the great fabricator of illusions; reality can be attained only by someone who is detached.

We must live together as brothers or perish together as fools.

I have no desire to make windows into mens souls

As our case is new, we must think and act anew.

It is always advisable to perceive clearly our ignorance.

I don't like definitions, but if there is a definition of freedom, it would be when you have control over your reality to transform it, to change it, rather than having it imposed upon you. You can't really ask for more than that.