Talent hits a target no one else can hit; Genius hits a target no one else can see.
Arthur Schopenhauer
It is the mark of a truly intelligent person to be moved by statistics.
George Bernard Shaw
I know that I am intelligent, because I know that I know nothing.
Socrates
Intelligence is really a kind of taste: taste in ideas.
Susan Sontag
When a true genius appears, you can know him by this sign: that all the dunces are in a confederacy against him.
Jonathan Swift
Ignorance is bold and knowledge reserved.
Thucydides
To be able to fill leisure intelligently is the last product of civilization.
Arnold J. Toynbee
I must have a prodigious quantity of mind; it takes me as much as a week sometimes to make it up.
Mark Twain
When I see a dolphin, I know it's just as smart as I am.
Don Van Vliet
Common sense is not so common.
Voltaire