The effects of imitation, habit, and association upon morals, would furnish ample matter for investigation. Considering how much the shape, texture, and conditions of the human body, influence morals, I submit it to the consideration of the ingenious, whether, in our endeavours to imitate moral examples, some advantage may not be derived, from our copying the features and external manners of the originals. What makes the success of this experiment probable is, that we generally find men, whose faces resemble each other, have the same manners and dispositions. I infer the possibility of success in an attempt to imitate originals in a manner that has been mentioned, from the facility with which domestics acquire a resemblance to their masters and mistresses, not only in manners, but in countenance, in those cases where they are tied to them by respect and affection. Husbands and wives also, where they possess the same species of face, under circumstances of mutual attachment, often acquire a resemblance to each other. From the general detestation in which hypocrisy is held, both by good and bad men, the mechanical effects of habit upon virtue have not been sufficiently explored. There are, I am persuaded, many instances where virtues have been assumed by accident, or necessity, which have become real from habit, and afterwards derived their nourishment from the heart. Hence the propriety of Hamlet's advice to his mother: "Assume a virtue, if you have it not. That monster, Custom, who all sense doth eat Of habits evil, is angel yet in this, That to the use of actions fair and good He likewise gives a frock or livery, That aptly is put on. Refrain to-night, And that shall lend a kind of easiness To the next abstinence; the next more easy: For use can almost change the stamp of nature, And master even the devil, or throw him out, With wondrous potency."