The only good is knowledge and the only evil is ignorance.
Real knowledge is to know the extent of one's ignorance.
Courage, conviction and confidence.
Science is a way of thinking much more than it is a body of knowledge.
If you can't explain it simply, you don't understand it well enough.
My weapon is literature
The reading of all good books is like conversation with the finest men of past centuries.
Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.
There is nothing more awful, insulting, and depressing than banality.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
Investigate, educate and organize.
Necessity is the mother of invention.
The only true wisdom is in knowing you know nothing.
Patience is a virtue, and I'm learning patience. It's a tough lesson.
I learned very early the difference between knowing the name of something and knowing something.
Most people have never learned that one of the main aims in life is to enjoy it.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
Free the child's potential, and you will transform him into the world.
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.
Physics is like sex: sure, it may give some practical results, but that's not why we do it.