Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

Knowing is not enough; we must apply. Willing is not enough; we must do.

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.

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

Knowing others is wisdom, knowing yourself is Enlightenment.

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

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.

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

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

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

Science is what we have learned about how to keep from fooling ourselves.

Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.

Don't worry that children never listen to you; worry that they are always watching you.

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

It is beyond a doubt that all our knowledge begins with experience.

You can never learn less, you can only learn more.

Reading without reflecting is like eating without digesting.

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.

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

There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.

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