Since the appeal of poetry is to the sympathy and thoughtfulness which all men possess, there is no need that it be directed, as ordinary speech is, to particular men and women whose help or advantage is sought. The poet addresses himself to man in general, and only so to you and me. Even when ostensibly directed to some particular person, a poem has an audience which is really universal. Except in the first moment of creative fervor, the friend invoked is never intended to be the sole recipient of the poet's words. Oftentimes the poet appeals to the dead or to natural objects which cannot hear him. One might perhaps infer from this that there is no genuine impulse to communication in poetry; that it is pure expression, a dialogue with self. But this would be a false inference; for there is always some hint in every poem that a vague background of possible auditors is bespoken. No matter how intimate and spontaneous, no poem can escape being social, and hence, in varying degrees, self-conscious. Art is autonomous expression meant to be contagious. The appeal of scientific expression is also to something universal in men--to their love of knowledge and understanding. But there is this difference between poetry and science: science seeks merely the intellectual mastery of things and ideas, and so is careless of their values; while poetry, even when descriptive or thoughtful, ever has _life_ as its theme--the way man reacts to his environment and his thought. Poetry is never purely descriptive or dialectical. And this difference in the substance of the expression determines a difference in the direction of interest within the expression. In scientific expression, words lead us away to things--pure description, or to their meanings--mathematics and dialectic; but in poetry, since the values which we attach to things and ideas come from within out of ourselves and are embodied in the words, they keep us to themselves; we dwell in the expression itself, in the verbal experience--its total content of sounds which we hear, ideas which we understand, and feelings which we appreciate, is of worth to us.