Dare to think for yourself.
Opinion is the medium between knowledge and ignorance.
A child educated only at school is an uneducated child.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
Better know nothing than half-know many things.
We could never learn to be brave and patient, if there were only joy in the world
Education is a system of imposed ignorance.
Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
The real solution lies in a world in which charity will have become unnecessary.
Industrialize or perish.
In mathematics you don't understand things. You just get used to them.
To educate a person in the mind but not in morals is to educate a menace to society.
As we acquire more knowledge, things do not become more comprehensible but more mysterious.
There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.
Education is our passport to the future, for tomorrow belongs to the people who prepare for it today.
The reading of all good books is like conversation with the finest men of past centuries.
Learning never exhausts the mind.
The progressive development of man is vitally dependent on invention.
A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.
Evil being the root of mystery, pain is the root of knowledge.