The truly evil thing is to act in such a way that peaceful life becomes impossible. War damages the fabric of civilisation not by the destruction it causes (the net effect of a war may even be to increase the productive capacity of the world as a whole), nor even by the slaughter of human beings, but by stimulating hatred and dishonesty. By shooting at your enemy you are not in the deepest sense wronging him. But by hating him, by inventing lies about him and bringing children up to believe them, by clamouring for unjust peace terms which make further wars inevitable, you are striking not at one perishable generation, but at humanity itself.