There are three attributes for which I am grateful to Fortune: that I was born, first, human and not animal; second, man and not woman; and third, Greek and not barbarian.
I did not become a father because I am fond of children.
Suretyship (Dogma) is the precursor of ruin.
We live not, in reality, on the summit of a solid earth but at the bottom of an ocean of air
The most difficult thing in life is to know yourself.
Nothing is more active than thought, for it travels over the universe, and nothing is stronger than necessity for all must submit to it.