You do not settle whether an argument is justified by merely showing that it is of some use. The distinction is not between useful and useless experiments but between barbarous and civilized behaviour. Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.
There are black zones of shadow close to our daily paths, and now and then some evil soul breaks a passage through. When that happens, the man who knows must strike before reckoning the consequences.
You are good when you are fully awake in your speech, Yet you are not evil when you sleep while your tongue staggers without purpose. And even stumbling speech may strengthen a weak tongue.
Centres, or centre-pieces of wood, are put by builders under an arch of stone while it is in the process of construction till the keystone is put in. Just such is the use Satan makes of pleasures to construct evil habits upon; the pleasure lasts till the habit is fully formed; but that done the habit may stand eternal. The pleasures are sent for firewood, and the hell begins in this life.
Change is always subjective. To talk of evil and misery is nonsense, because they do not exist outside. If I am immune from all anger, I never feel angry. If am immune from all hatred, I never feel hatred.
Every living body continuously eliminates feces, it rejects what is not serviceable to the assimilating organism: what man despises, what arouses his disgust, what he calls evil, are excrements.
Do not resist the evil-doer and take no part in doing so, either in the violent deeds of the administration, in the law courts, the collection of taxes, or above all in soldiering, and no one in the world will be able to enslave you.