Common sense is not so common.
Voltaire

Every true genius is bound to be naive.
Friedrich Schiller


Genius is more often found in a cracked pot than in a whole one.
E. B. White


I must have a prodigious quantity of mind; it takes me as much as a week sometimes to make it up.
Mark Twain

Intelligence without ambition is a bird without wings.
Salvador Dali


It's not that I'm so smart, it's just that I stay with problems longer.
Albert Einstein