There is only one step
from fanaticism to barbarism.

Denis Diderot

Extremism means borders beyond which life ends,
and a passion for extremism, in art and in politics,
is a veiled longing for death.

Milan Kundera

"Those to whom evil is done
Do evil in return."

W.H. Auden

From the earliest dawnings of policy to this day, the invention of man has been sharpening and improving the mystery of murder, from the first rude essays of clubs and stones, to the present perfection of gunnery.

Edmund Burke
A Vindication of Natural Society