THE ORIGIN AND NATURE OF THE EMOTIONS _Introductory_ Most persons who have written about the emotions and man's conduct of life seem to discuss, not the natural things which follow the common laws of Nature, but things which are outside her. They seem indeed to consider man in Nature as a kingdom within a kingdom. For they believe that man disturbs rather than follows her order; that he has an absolute power over his own actions; and that he is altogether self-determined. They then proceed to attribute the cause of human weakness and changeableness, not to the common power of Nature, but to some vice of human nature, which they therefore bewail, laugh at, mock, or, as is more generally the case, detest; whilst he who knows how to revile most eloquently or subtilely the weakness of the mind is looked upon as divine. It is true that very eminent men have not been wanting, to whose labor and industry we confess ourselves much indebted, who have written many excellent things about the right conduct of life, and who have given to mortals counsels full of prudence. But no one so far as I know has determined the nature and strength of the emotions, and what the mind is able to do towards controlling them. I remember, indeed, that the celebrated Descartes, although he believed that the mind is absolute master over its own actions, tried nevertheless to explain by their first causes human emotions, and at the same time to show the way by which the mind could obtain absolute power over them. But in my opinion he has shown nothing but the acuteness of his great intellect, as I shall make evident in the proper place, for I wish to return to those who prefer to detest and scoff at human affects and actions than understand them.