Necessity is the mother of invention.

If there were no bad people, there would be no good lawyers.

What is freedom of expression? Without the freedom to offend, it ceases to exist.

There is nothing more awful, insulting, and depressing than banality.

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

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

I am indebted to my father for living, but to my teacher for living well.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

Know what you are talking about.

Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

Learning never exhausts the mind.

Never help a child with a task at which he feels he can succeed.

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

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

Education is the most powerful weapon which you can use to change the world.

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.

Suddenly degrees aren't worth anything. Isn't that true? When I was a student, if you had a degree, you had a job. If you didn't have a job it's because you didn't want one. And I didn't want one, frankly.

The fullness of knowledge only comes through the awareness of ignorance.

The great difficulty in education is to get experience out of ideas.

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

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