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.

Patience is a virtue, and I'm learning patience. It's a tough lesson.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

Imagination is more important than knowledge.

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

The knowledge of all things is possible

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

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

An investment in knowledge pays the best interest.

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

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

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

I am so clever that sometimes I don't understand a single word of what I am saying.

Opinion is the medium between knowledge and ignorance.

A thought is an idea in transit.

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

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

Don't learn to do, but learn in doing.

Educate the children and it won't be necessary to punish the men.

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.