There is no authority who decides what is a good idea.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
The secret of life is not enjoyment but education through experience.
The most important part of teaching is to teach what it is to know.
Science is what we have learned about how to keep from fooling ourselves.
If I have seen further it is by standing on the shoulders of Giants.
The more I read, the more I acquire, the more certain I am that I know nothing.
Knowing is not enough; we must apply. Willing is not enough; we must do.
Don't learn to do, but learn in doing.
Science is a way of thinking much more than it is a body of knowledge.
Courage, conviction and confidence.
A witty saying proves nothing.
Better know nothing than half-know many things.
Educate the children and it won't be necessary to punish the men.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
The most savage controversies are those about matters as to which there is no good evidence either way.
The highest result of education is tolerance.
The highest activity a human being can attain is learning for understanding, because to understand is to be free.
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.
If help and salvation are to come, they can only come from the children, for the children are the makers of men.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.