It is better to know how to learn than to know.

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

Don't worry that children never listen to you; worry that they are always watching you.

When you know better you do better.

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

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

An investment in knowledge pays the best interest.

The most important part of teaching is to teach what it is to know.

The progressive development of man is vitally dependent on invention.

Science is what we have learned about how to keep from fooling ourselves.

A witty saying proves nothing.

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.

Courage, conviction and confidence.

I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.

Make it a rule never to give a child a book you would not read yourself.

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

The whole of science is nothing more than a refinement of everyday thinking.

The highest result of education is tolerance.

Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

Real knowledge is to know the extent of one's ignorance.