We could never learn to be brave and patient, if there were only joy in the world

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

If the facts don't fit the theory, change the facts.

I do not know how to teach philosophy without becoming a disturber of the peace.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

The more I read, the more I acquire, the more certain I am that I know nothing.

Common sense is the collection of prejudices acquired by age eighteen.

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

What sculpture is to a block of marble, education is to a human soul.

Technology is just a tool. In terms of getting the kids working together and motivating them, the teacher is the most important.

Human behavior flows from three main sources: desire, emotion, and knowledge

I decided to teach because I think that any person who studies philosophy has to be involved actively.

A cynic is a man who knows the price of everything, and the value of nothing.

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

Science is a way of thinking much more than it is a body of knowledge.

A child educated only at school is an uneducated child.

The first idea the child must acquire is that of the difference between good and evil.

That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.

Learning gives creativity, Creativity leads to thinking, Thinking provides knowledge, Knowledge makes you great.

If you can't explain it simply, you don't understand it well enough.

The task of a writer is not to solve the problem but to state the problem correctly.