For to be poised against fatality, to meet adverse conditions gracefully, is more than simple endurance; it is an act of aggression, a positive triumph.
— Thomas Mann

The basic difference between being assertive and being aggressive is how our words and behavior affect the rights and well being of others.
Sharon Anthony Bower aggressions quote

History teaches that war begins when governments believe the price of aggression is cheap.
— Ronald Reagan

The tendency of aggression is an innate, independent, instinctual disposition in man... it constitutes the most powerful obstacle to culture.
— Sigmund Freud

Modern man believes he is fruitful and productive when his ego is aggressively affirmed, when he is visibly active, and when his action produces obvious results.
— aggressions quotation by Thomas Merton