把这一句，留给此刻的你

The Dark Arts are many, varied, ever-changing and eternal. Fighting them is like fighting a many-headed monster, which, each time a neck is severed, sprouts a head even fiercer and cleverer than before. You are fighting that which is unfixed, mutating, indestructible.

黑魔法是多种多样、千变万化和永恒的。打它们就像打一个多头怪物，每割下一个脖子，就会长出一个比以前更凶猛、更聪明的脑袋。你们正在与那不固定的、变异的、坚不可摧的东西战斗。

— Severus Snape 西弗勒斯·斯内普