Since the days of Descartes it has been a conception familiar to philosophers that every visible event in nature might be explained by previous visible events, and that all the motions, for instance, of the tongue in speech, or of the hand in painting, might have merely physical causes. If consciousness is thus accessory to life and not essential to it, the race of man might have existed upon the earth and acquired all the arts necessary for its subsistence without possessing a single sensation, idea, or emotion. Natural selection might have secured the survival of those automata which made useful reactions upon their environment. An instinct would have been developed, dangers would have been shunned without being feared, and injuries avenged without being felt.

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The difficulty, after having the experience to symbolize, lies only in having enough imagination to suspend it in a thought; and further to give this thought such verbal expression that others may be able to decipher it, and to be stirred by it as by a wind of suggestion sweeping the whole forest of their memories.

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Masks are arrested expressions and admirable echoes of feeling, at once faithful, discrete, and superlative. Living things in contact with the air must acquire a cuticle, and it is not urged against cuticles that they are not hearts; yet some philosophers seem to be angry with images for not being things, and with words for not being feelings. Words and images are like shells, no less integral parts of nature than are the substances they cover, but better addressed to the eye and more open to observation. I would not say that substance exists for the sake of appearance, or faces for the sake of masks, or the passions for the sake of poetry and virtue. Nothing arises in nature for the sake of anything else; all these phases and products are involved equally in the round of existence.