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

Intelligence is the wife, imagination is the mistress, memory is the servant

It is the mark of a truly intelligent person to be moved by statistics

I choose my friends for their good looks, my acquaintances for their good characters, and my enemies for their intellects. A man cannot be too careful in the choice of his enemies.

Man is the most intelligent of the animals - and the most silly

Happiness in intelligent people is the rarest thing I know