Every Action has its proper Thought, and every Thought its proper Expression. And these Correspondences are not imaginary, but have a real Foundation in Nature: For when any one of these is wanting, the whole is lame and defective, but when they all meet and conspire together, the Character is then genuine and compleat, the Thing or Person design’d is drawn to the Life, and the Reader is left uncertain, whether the Character, that lies before him, is an Effect of Art, or a real Appearance of Nature.--A Master-Piece of this Kind, requires the Hand of one who is a Critic in Men and Manners, a Critic in Thoughts, and a Critic in Language. A superficial Knowledge of human Nature, will never qualify a Man to be a Writer of Characters. He must be a Master of the Science; and be able to lead a Reader, knowingly, thro’ that Labyrinth of the Passions, which fill the Heart of Man, and make him either a noble or a despicable Creature. For tho’ some, who have never attempted any thing of this kind, may think it an easy Matter to write two or three Pages of Morality with Spirit, to describe an Action, a Passion, a Manner; yet had they made the Experiment, the Event wou’d not have answer’d their Expectation, and they wou’d have found, that this easy Work was more difficult than they, at first, imagin’d. The Features of every single Passion must be known; the Relation which that Passion bears to another, must be discover’d; and the Harmony and Discord which result from them must be felt. Many have studied these Things, but few have thoroughly understood them. The Labour is vast; ’tis almost infinite; and yet without a Knowledge of these Things, ’twill be impossible ever to draw a Character so to the Life, as that it shall hit one Person, and him only. We have all of us different Souls, and our Souls have Affections as different from one another, as our outward Faces are in their Lineaments. Each Man contains a little World within himself, and every Heart is a new World. We cannot therefore attain to a perfect Knowledge of human Nature, by studying others or our selves alone, but by studying both. ’Tis this Knowledge which sets the Philosopher above the Peasant, and gives the Preference to one Author above another. This Knowledge has a Force, something like to that of Magic Charms: by the help of it one, who is Master of the Science, can turn Men inside outwards, and expose them to the Eyes of the World, as they really are, and not as they wou’d fain appear to be. By the help of this Knowledge an intelligent Writer can form to his Reader the most agreeable, most instructive Entertainment that can possibly be desir’d; transport him, with the greatest Ease imaginable, from the Solitude of his Chamber to Places of the greatest Concourse; there to see and learn the Virtues of Men; there to see and shun their Vices, without any danger of being corrupted by the Contagion of a real Commerce.