All stable processes we shall predict. All unstable processes we shall control.

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.

The whole of science is nothing more than a refinement of everyday thinking.

The man who does not read good books has no advantage over the man who can't read them.

We could never learn to be brave and patient, if there were only joy in the world

The progressive development of man is vitally dependent on invention.

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

If you're not learning while you're earning, you're cheating yourself out of the better portion of your compensation.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

A spirit of national masochism prevails, encouraged by an effete corps of impudent snobs who characterize themselves as intellectuals.

A little knowledge is a dangerous thing. So is a lot.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

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.

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.

I think that kids have a greater capacity for processing things than we give them credit for.

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

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

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.

Opinion is the medium between knowledge and ignorance.

If you can't explain it simply, you don't understand it well enough.

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