I know that I am intelligent, because I know that I know nothing.
Thales of Miletus
Those who can make you believe absurdities can make you commit atrocities.
Voltaire
Quiet people have the best minds.
Stephen Hawking
I have no greater pleasure than to have a problem to solve.
Leonardo da Vinci
Aimless extension of knowledge, however, which is what I think you really mean by the term curiosity, is merely inefficiency.
Isaac Asimov
The greatest enemy of knowledge is not ignorance – it is the illusion of knowledge.
Knowledge is power. Education is liberation.
Princess Diana
I never did anything worth doing by accident, nor did any of my inventions come by accident; they came by work.
Thomas Edison
No one can reveal to you nothing but that which already lies half-asleep in the dawning of your knowledge.
Kahlil Gibran
A little knowledge that acts is worth infinitely more than much knowledge that is idle.
There is no substitute for hard work.
Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.
He who knows, does not speak. He who speaks, does not know.
Lao Tzu
Wealth is the ability to fully experience life.