The progressive development of man is vitally dependent on invention.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

A witty saying proves nothing.

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

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.

Better know nothing than half-know many things.

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

Make it a rule never to give a child a book you would not read yourself.

An investment in knowledge pays the best interest.

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

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

The most important part of teaching is to teach what it is to know.

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

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

I like poems you can tack all over with a hammer and there are no hollow places.

Science is not only a disciple of reason but, also, one of romance and passion.

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.

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

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

The most savage controversies are those about matters as to which there is no good evidence either way.