All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

Johann Wolfgang von Goethe

An intellectual is someone whose mind watches itself.

Albert Camus

Intelligence without ambition is a bird without wings.

Salvador Dali

Man becomes man only by his intelligence, but he is man only by his heart.

Henri Frederic Amiel

The mind is not a vessel to be filled but a fire to be kindled.

Plutarch

Smartness runs in my family. When I went to school I was so smart my teacher was in my class for five years.

Gracie Allen