Shews in what manner anger and revenge operate in the mind, and how ambition is capable of stifling both, in a remarkable instance, that _private injuries_, how great soever, may seem of no weight, when _public grandeur_ requires they should be looked over, Page 168. CHAP. II. Shews at what age men are most liable to the passion of grief: the impatience of human nature under affliction, and the necessity there is of exerting reason, to restrain the excesses it would otherwise occasion, Page 178. CHAP. III. The struggles which different passions occasion in the human breast, are here exemplified; and that there is no one among them so strong, but may be extirpated by another, excepting _revenge_, which knows no period, but by gratification, Page 185. CHAP. IV. Contains a further definition of _revenge_, its force, effects, and the chasm it leaves on the mind when once it ceases. The tranquility of being entirely devoid of all passions; and the impossibility for the soul to remain in that state of inactivity is also shewn; with some remarks on human nature in general, when left to itself, Page 190. CHAP. V. Contains a remarkable proof, that tho' the passions may operate with greater velocity and vehemence in youth, yet they are infinitely more strong and permanent, when the person is arrived at maturity, and are then scarce ever eradicated. Love and friendship are then, and not till then, truly worthy of the names they bear; and that the _one_ between those of different sexes, is always the consequence of the _other_, Page 206. CHAP. VI. How the most powerful emotions of the _mind_ subside, and grow weaker in proportion as the strength of the _body_ decays, is here exemplified; and that such passions as remain after a certain age, are not properly the incentives of nature but of example, long habitude, or ill humour, Page 224. LIFE's PROGRESS THROUGH THE PASSIONS. INTRODUCTION.