It is therefore not a sufficient vindication of a character, that it is drawn as it appears; for many characters ought never to be drawn: nor of a narrative, that the train of events is agreeable to observation and experience; for that observation which is called knowledge of the world, will be found much more frequently to make men cunning than good. The purpose of these writings is surely not only to shew mankind, but to provide that they may be seen hereafter with less hazard; to teach the means of avoiding the snares which are laid by Treachery for Innocence, without infusing any wish for that superiority with which the betrayer flatters his vanity; to give the power of counteracting fraud, without the temptation to practise it; to initiate youth by mock encounters in the art of necessary defence, and to increase prudence without impairing virtue. Many writers, for the sake of following nature, so mingle good and bad qualities in their principal personages, that they are both equally conspicuous; and as we accompany them through their adventures with delight, and are led by degrees to interest ourselves in their favour, we lose the abhorrence of their faults, because they do not hinder our pleasure, or, perhaps, regard them with some kindness, for being united with so much merit. There have been men indeed splendidly wicked, whose endowments threw a brightness on their crimes, and whom scarce any villany made perfectly detestable, because they never could be wholly divested of their excellencies; but such have been in all ages the great corrupters of the world, and their resemblance ought no more to be preserved, than the art of murdering without pain. Some have advanced, without due attention to the consequences of this notion, that certain virtues have their correspondent faults, and therefore that to exhibit either apart is to deviate from probability. Thus men are observed by Swift to be "grateful in the same degree as they are resentful." This principle, with others of the same kind, supposes man to act from a brute impulse, and pursue a certain degree of inclination, without any choice of the object; for, otherwise, though it should be allowed that gratitude and resentment arise from the same constitution of the passions, it follows not that they will be equally indulged when reason is consulted; yet, unless that consequence be admitted, this sagacious maxim becomes an empty sound, without any relation to practice or to life.