The whole of science is nothing more than a refinement of everyday thinking.
The first idea the child must acquire is that of the difference between good and evil.
In mathematics you don't understand things. You just get used to them.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
A thought is an idea in transit.
An investment in knowledge pays the best interest.
Investigate, educate and organize.
The reading of all good books is like conversation with the finest men of past centuries.
You can never be overdressed or overeducated.
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.
Education is the best friend. An educated person is respected everywhere. Education beats the beauty and the youth.
The highest activity a human being can attain is learning for understanding, because to understand is to be free.
If the facts don't fit the theory, change the facts.
One test of the correctness of educational procedure is the happiness of the child.
Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.
Dare to think for yourself.
Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
Free the child's potential, and you will transform him into the world.
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 most important part of teaching is to teach what it is to know.
The more I read, the more I acquire, the more certain I am that I know nothing.