Quotes on Ignorant

I often think that men don't understand what is noble and what is ignorant, though they always talk about it.

Animals don't know as much about jealousy as people, but they're not ignorant of it, either.

The man whose whole life is spent in performing a few simple operations, of which the effects are perhaps always the same, or very nearly the same, has no occasion to exert his understanding or to exercise his invention in finding out expedients for removing difficulties which never occur. He naturally loses, therefore, the habit of such exertion, and generally becomes as stupid and ignorant as it is possible for a human creature to become.

A learned blockhead is a greater blockhead than an ignorant one.

If I am given a formula, and I am ignorant of its meaning, it cannot teach me anything, but if I already know it what does the formula teach me?

We are all born ignorant, but one must work hard to remain stupid.