If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
The most savage controversies are those about matters as to which there is no good evidence either way.
What sculpture is to a block of marble, education is to a human soul.
Make it a rule never to give a child a book you would not read yourself.
No power and no treasure can outweigh the extension of our knowledge.
I cannot live without books.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
The first principle is that you must not fool yourself and you are the easiest person to fool.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
There is no authority who decides what is a good idea.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
It is what you read when you don't have to that determines what you will be when you can't help it.
We could never learn to be brave and patient, if there were only joy in the world
What is now proved was once only imagined.
The fullness of knowledge only comes through the awareness of ignorance.
Common sense is the collection of prejudices acquired by age eighteen.
The direction in which education starts a man will determine his future in life
It is possible to fly without motors, but not without knowledge and skill.
There is nothing more awful, insulting, and depressing than banality.
The only true wisdom is in knowing you know nothing.
A thought is an idea in transit.