Human behavior flows from three main sources: desire, emotion, and knowledge

What we know is a drop, what we don't know is an ocean.

The only good is knowledge and the only evil is ignorance.

The ability to observe without evaluating is the highest form of intelligence.

Opinion is the medium between knowledge and ignorance.

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

Education is the best friend. An educated person is respected everywhere. Education beats the beauty and the youth.

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

Courage, conviction and confidence.

Imagination is more important than knowledge.

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

Science is a way of thinking much more than it is a body of knowledge.

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.

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

The great difficulty in education is to get experience out of ideas.

Education is the kindling of a flame, not the filling of a vessel.

The books that the world calls immoral are books that show the world its own shame.

I learned very early the difference between knowing the name of something and knowing something.

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

Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.

Education is a human right with immense power to transform. On its foundation rest the cornerstones of freedom, democracy and sustainable human development.