I have discovered nothing new, I have only perceived what I already knew.

The only thing that we know is that we know nothing and that is the highest flight of human wisdom.

Life consists in penetrating the unknown, and fashioning our actions in accord with the new knowledge thus acquired.

The essence of all slavery consists in taking the product of another's labor by force. It is immaterial whether this force be founded upon ownership of the slave or ownership of the money that he must get to live.

Some mathematician has said pleasure lies not in discovering truth, but in seeking it.

There is no greatness where there is not simplicity, goodness, and truth