The necessary consequence of man's right to life is his right to self-defense. In a civilized society, force may be used only in retaliation and only against those who initiate its use. All the reasons which make the initiation of physical force an evil, make the retaliatory use of physical force a moral imperative. If some "pacifist" society renounced the retaliatory use of force, it would be left helplessly at the mercy of the first thug who decided to be immoral. Such a society would achieve the opposite of its intention: instead of abolishing evil, it would encourage and reward it.
Ayn RandFight for the value of your person. Fight for the virtue of your pride. Fight for the essence of that which is man: for his sovereign rational mind. Fight with the radiant certainty and the absolute rectitude of knowing that yours is the Morality of Life and that yours is the battle for any achievement, any value, any grandeur, any goodness, any joy that has ever existed on this earth
Ayn RandIn western civilization, the period ruled by mysticism is known as the 'Dark Ages' and the 'Middle Ages'. I will assume that you know the nature of that period and the state of human existence in those ages. The Renaissance broke the rules of the mystics. "Renaissance" means the "rebirth". Few people today will care to remind you that it was a rebirth of reason - of man's mind.
Ayn Rand