The only thing more expensive than education is ignorance.

Admiration is the daughter of ignorance.

...It is in the religion of ignorance that tyranny begins...

The doorstep to the temple of wisdom is a knowledge of our own ignorance.

Nothing brings more pain than too much pleasure; nothing more bondage than too much liberty, (or libertinism.)

The man who achieves makes many mistakes, but he never makes the biggest mistake of all - doing nothing