The Delphic Oracle said I was the wisest of all the Greeks. It is because that I alone, of all the Greeks, know that I know nothing.

The only true wisdom is in knowing you know nothing.

Man must rise above the Earth - to the top of the atmosphere and beyond - for only thus will he fully understand the world in which he lives.

A disorderly mob is no more an army than a heap of building materials is a house

There are two kinds of disease of the soul, vice and ignorance.

I swear it upon Zeus an outstanding runner cannot be the equal of an average wrestler.

A multitude of books distracts the mind.