To every action there is always an equal and opposite or contrary, reaction

The task of a writer is not to solve the problem but to state the problem correctly.

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

Courage, conviction and confidence.

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.

The man who does not read good books has no advantage over the man who can't read them.

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

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.

I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.

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

Education is an ornament for the prosperous, a refuge for the unfortunate.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

I am so clever that sometimes I don't understand a single word of what I am saying.

Opinion is the medium between knowledge and ignorance.

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

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

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

It is what you read when you don't have to that determines what you will be when you can't help it.

There is no authority who decides what is a good idea.

The only true wisdom is in knowing you know nothing.

What is now proved was once only imagined.