The only good is knowledge and the only evil is ignorance.
The secret of life is not enjoyment but education through experience.
The highest activity a human being can attain is learning for understanding, because to understand is to be free.
What is now proved was once only imagined.
What sculpture is to a block of marble, education is to a human soul.
Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Better know nothing than half-know many things.
If you can't explain it simply, you don't understand it well enough.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
I cannot live without books.
The more I read, the more I acquire, the more certain I am that I know nothing.
My alma mater was books, a good library.... I could spend the rest of my life reading, just satisfying my curiosity.
What we know is a drop, what we don't know is an ocean.
Don't worry that children never listen to you; worry that they are always watching you.
Science is what we have learned about how to keep from fooling ourselves.
Show me a family of readers, and I will show you the people who move the world.
The first principle is that you must not fool yourself and you are the easiest person to fool.
You can never be overdressed or overeducated.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
Never help a child with a task at which he feels he can succeed.