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

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

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

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

Knowledge becomes evil if the aim be not virtuous.

The knowledge of all things is possible

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

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

The progressive development of man is vitally dependent on invention.

No man's knowledge here can go beyond his experience.

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

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

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

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

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.

A child miseducated is a child lost.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

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

In mathematics you don't understand things. You just get used to them.

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