So far as we are human, what we do must be either evil or good: so far as we do evil or good, we are human: and it is better, in a paradoxical way, to do evil than to do nothing: at least we exist.
For though a man should be a complete unbeliever in the being of gods; if he also has a native uprightness of temper, such persons will detest evil in men; their repugnance to wrong disinclines them to commit wrongful acts; they shun the unrighteous and are drawn to the upright.
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.
CALLOUS, adj. Gifted with great fortitude to bear the evils afflicting another. When Zeno was told that one of his enemies was no more he was observed to be deeply moved. "What!" said one of his disciples, "you weep at the death of an enemy?" "Ah, 'tis true," replied the great Stoic; "but you should see me smile at the death of a friend.".
An pretend and evil friend is haughty to be feared than a unmanageable beast; a unmanageable beast may mouthful your build up, but an evil friend fortitude mouthful your intellect.