Real knowledge is to know the extent of one's ignorance.

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

An investment in knowledge pays the best interest.

I cannot live without books.

Investigate, educate and organize the country must progress, productive works and industries are the main avenues at present next to education for the advancement of the country

In order to stave off covetouness, greed, and spite, citizens world over must be educated.

I decided to teach because I think that any person who studies philosophy has to be involved actively.

Knowledge becomes evil if the aim be not virtuous.

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

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

What is freedom of expression? Without the freedom to offend, it ceases to exist.

Those who fail to learn the lessons of history are doomed to repeat them.

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

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

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

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

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

Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.

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.

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

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