From Retaliatory Force
It is only as retaliation that force may be used and only against the man who starts its use. No, I do not share his evil or sink to his concept of morality: I merely grant him his choice, destruction, the only destruction he had the right to choose: his own. He uses force to seize a value; I use it only to destroy destruction.

For the New Intellectual: Galt’s Speech,
For the New Intellectual, 135