Courage, conviction and confidence.
The task of a writer is not to solve the problem but to state the problem correctly.
Books are for people who wish they were somewhere else.
Common sense is the collection of prejudices acquired by age eighteen.
Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.
The fullness of knowledge only comes through the awareness of ignorance.
Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
What we know is a drop, what we don't know is an ocean.
When you know better you do better.
No power and no treasure can outweigh the extension of our knowledge.
Don't learn to do, but learn in doing.
The secret of life is not enjoyment but education through experience.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.
The man who is fond of books is usually a man of lofty thought, and elevated opinions.
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 cannot teach anybody anything. I can only make them think
Necessity is the mother of invention.
We could never learn to be brave and patient, if there were only joy in the world
The most savage controversies are those about matters as to which there is no good evidence either way.
The deepest sin against the human mind is to believe things without evidence.