Nothing can be produced out of nothing.

I am called a dog because I fawn on those who give me anything, I yelp at those who refuse, and I set my teeth in rascals.

It was a favorite expression of Theophrastus that time was the most valuable thing that a man could spend.

Education gives sobriety to the young, comfort to the old, riches to the poor and is an ornament to the rich.

To become self-educated you should condemn yourself for all those things that you would criticize others.

Democritus says, "But we know nothing really; for truth lies deep down".

I have nothing to ask but that you would remove to the other side, that you may not, by intercepting the sunshine, take from me what you cannot give.