It is not so evident at first sight, that a relation of impressions is requisite to these passions, and that because in the transition the one impression is so much confounded with the other, that they become in a manner undistinguishable. But as in pride and humility, we have easily been able to make the separation, and to prove, that every cause of these passions, produces a separate pain or pleasure, I might here observe the same method with the same success, in examining particularly the several causes of love and hatred. But as I hasten a full and decisive proof of these systems, I delay this examination for a moment: And in the mean time shall endeavour to convert to my present purpose all my reasonings concerning pride and humility, by an argument that is founded on unquestionable examination. There are few persons, that are satisfyed with their own character, or genius, or fortune, who are nor desirous of shewing themselves to the world, and of acquiring the love and approbation of mankind. Now it is evident, that the very same qualities and circumstances, which are the causes of pride or self-esteem, are also the causes of vanity or the desire of reputation; and that we always put to view those particulars with which in ourselves we are best satisfyed. But if love and esteem were not produced by the same qualities as pride, according as these qualities are related to ourselves or others, this method of proceeding would be very absurd, nor could men expect a correspondence in the sentiments of every other person, with those themselves have entertained. It is true, few can form exact systems of the passions, or make reflections on their general nature and resemblances. But without such a progress in philosophy, we are not subject to many mistakes in this particular, but are sufficiently guided by common experience, as well as by a kind of presentation; which tells us what will operate on others, by what we feel immediately in ourselves. Since then the same qualities that produce pride or humility, cause love or hatred; all the arguments that have been employed to prove, that the causes of the former passions excite a pain or pleasure independent of the passion, will be applicable with equal evidence to the causes of the latter. SECT. II EXPERIMENTS TO CONFIRM THIS SYSTEM Upon duly weighing these arguments, no one will make any scruple to assent to that conclusion I draw from them, concerning the transition along related impressions and ideas, especially as it is a principle, in itself, so easy and natural. But that we may place this system beyond doubt both with regard to love and hatred, pride and humility, it will be proper to make some new experiments upon all these passions, as well as to recall a few of these observations, which I have formerly touched upon.