It is provoked by what we call personal or social charm, a genuine kindliness of manner, an open-handed sincerity and frankness, considerateness, gentleness, whimsicality. Which particular social graces will win our affections depends of course on our own interests, equipment, and fund of instinctive and acquired sympathies. Popular psychology has in various proverbs hit at and not entirely missed some of the obvious and contradictory elements: "Opposites attract," "Birds of a feather flock together," and so on. Intellectual qualities, in persons of marked intellectual interests, will also sustain friendship and deepen an instinctive liking. Friendships thus begin in accident and are continued through community of interest. It is to be questioned whether merely striking intellectual qualities initiate a friendship. They may command admiration and respect, but liking, friendship, and love have a more emotional and personal basis. This same warm affectionate appreciation that nearly all people have for other persons, fewer people--great poets, philosophers, and enthusiastic leaders of men--have for causes, institutions, and ideas. One feels in the works of great thinkers the same warmth and loyalty to ideas and causes that ordinary people display toward their friends. Plato has given for all time the progress of love from attachment to a single individual through to institutions, ideas, and what he called mystically the idea of beauty itself. For he who would proceed rightly in this matter should begin in youth to turn to beautiful forms; and first, if his instructor guide him rightly, he should learn to love one such form only--out of that he should create fair thoughts, and soon he will himself perceive that the beauty of one form is truly related to the beauty of another, and then if beauty in general is his pursuit, how foolish would he be not to recognize that the beauty in every form is one and the same! And when he perceives this he will abate his violent love of the one, which he will despise and deem a small thing, and will become a lover of all beautiful forms; this will lead him on to consider that the beauty of the mind is more honorable than the beauty of the outward form. So that if a virtuous soul have but a little comeliness, he will be content to love and tend him... until his beloved is compelled to contemplate and see the beauty of institutions and laws, and understand that all is of one kindred; and that personal beauty is only a trifle; and after laws and institutions, he will lead him on to the sciences, that he may see their beauty... until at length he grows and waxes strong, and at last the vision is revealed to him of a single science which is the science of beauty everywhere.[l] [Footnote 1: Plato: _Symposium_ (Jowett translation), p. 502.]