Events follow from the same Causes. Ambition, Avarice, Self-love, Vanity, Friendship, Generosity, public Spirit; these Passions, mix'd in various Degrees, and distributed thro' Society, have been, from the Beginning of the World, and still are, the Sources of all the Actions and Enterprizes, that have ever been observ'd amongst Mankind. Would you know the Sentiments, Inclinations, and Course of Life of the Greeks and Romans? Study well the Temper and Actions of the French and English. You cannot be much mistaken in transferring to the former most of the Observations you have made with regard to the latter. Mankind are so much the same, in all Times and Places, that History informs us of nothing new or strange in this particular. Its chief Use is only to discover the constant and universal Principles of human Nature, by shewing Men in all Varieties of Circumstances and Situations, and furnishing us with Materials, from which we may form our Observations, and become acquainted with the regular Springs of human Action and Behaviour. These Records of Wars, Intrigues, Factions, and Revolutions are so many Collections of Experiments, by which the Politician or moral Philosopher fixes the Principles of his Science; in the same Manner as the Physician or natural Philosopher becomes acquainted with the Nature of Plants, Minerals, and other external Objects, by the Experiments, which he forms concerning them. Nor are the Earth, Water, and other Elements, examin'dby
