Evil had to manifest itself and fulfill its role, so that ultimately Good could prevail. [...] Evil needs to manifest itself, for them to understand the value of Good.
You need not attempt to shake off or to banter off Romance. It is an evil you will never get rid of to the end of your days. It is a part of yourself ... of your soul. Age will only mellow it a little, and give it a holier tone.
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.