Necessity is the mother of invention.
The books that the world calls immoral are books that show the world its own shame.
Knowing is not enough; we must apply. Willing is not enough; we must do.
Suddenly degrees aren't worth anything. Isn't that true? When I was a student, if you had a degree, you had a job. If you didn't have a job it's because you didn't want one. And I didn't want one, frankly.
Books are as useful to a stupid person as a mirror is useful to a blind person.
The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
Books are for people who wish they were somewhere else.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
Human behavior flows from three main sources: desire, emotion, and knowledge
I decided to teach because I think that any person who studies philosophy has to be involved actively.
The knowledge of all things is possible
An investment in knowledge pays the best interest.
When you know better you do better.
Those who fail to learn the lessons of history are doomed to repeat them.
No man's knowledge here can go beyond his experience.
Imagination is more important than knowledge.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
The direction in which education starts a man will determine his future in life
The man who is fond of books is usually a man of lofty thought, and elevated opinions.
Real knowledge is to know the extent of one's ignorance.