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

Courage, conviction and confidence.

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

Just because I don't care doesn't mean I don't understand.

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

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

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

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

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.

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

If I could explain it to the average person, I wouldn't have been worth the Nobel Prize.

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

Reading is to the mind what exercise is to the body.

Opinion is the medium between knowledge and ignorance.

It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.

A witty saying proves nothing.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

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

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 task of a writer is not to solve the problem but to state the problem correctly.

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion