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For, as the eddies exercise no sure control over the bodies carried round and round in them, but, since the bodies are carried round and round by a compelling force, while they naturally tend to sink, there results from the two a confused and erratic circular movement, so, in like manner, what is called inspiration seems to be a combination of two impulses, the soul being simultaneously impelled through one of these by some external influence, and through the other by its own nature. Wherefore it is not possible to deal with inanimate and stationary bodies in a way contrary to their nature by bringing force to bear upon them, nor to make a cylinder in motion behave in the manner of a sphere or a cube, nor a lyre like a flute, nor a trumpet like a harp. No, the use of each thing artistically is apparently no other than its natural use. And as for the animate, endowed with power to move of itself and with its share of initiative and reason, could anyone treat it in a manner other than in keeping with the condition, faculty, or nature, already pre-existent in it, as, for example, trying to arouse to music a mind unmusical, or to letters the unlettered, or to eloquence one with no observation or training in speeches? That is something which no one could assert.