This is the crux of the moral pessimists: if they really wanted to promote their neighbor's redemption, then they would have to resolve themselves to spoiling existence for him, and thus to being his misfortune; out of pity, they would have to--become evil!
That virtue therefore which is but a youngling in the contemplation of evil, and knows not the utmost that vice promises to her followers, and rejects it, is but a blank virtue, not a pure; her whiteness is but an excremental whiteness.
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.
The plea of good intentions is not one that can be allowed to have much weight in passing historical judgment upon a man whose wrong-headedness and distorted way of looking at things produced, or helped to produce, such incalculable evil; there is a wide political applicability in the remark attributed to a famous Texan, to the effect that he might, in the end, pardon a man who shot him on purpose, but that he would surely never forgive one who did so accidentally.
Know thyself as the pride of His creation, the link uniting divinity and matter; behold a part of God Himself within thee; remember thine own dignity nor dare descend to evil or meanness.