Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.

The only good is knowledge and the only evil is ignorance.

Most people have never learned that one of the main aims in life is to enjoy it.

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

Free the child's potential, and you will transform him into the world.

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.

The deepest sin against the human mind is to believe things without evidence.

Dare to think for yourself.

If you're teaching today what you were teaching five years ago, either the field is dead or you are.

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

An investment in knowledge pays the best interest.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

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

Study without desire spoils the memory, and it retains nothing that it takes in.

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.

I cannot teach anybody anything. I can only make them think

To every action there is always an equal and opposite or contrary, reaction

If I have seen further it is by standing on the shoulders of Giants.

No power and no treasure can outweigh the extension of our knowledge.

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

There is no authority who decides what is a good idea.