THE AFFECTIONS OF THE SOUL COMPARED TO A MUSICIAN PLAYING THE LYRE.
We might further consider whether, inasmuch as opinion originates in a higher principle (of the soul), this principle does not remain immovable because it is the form of harmony, while the cause of the movement plays the role of the musician, and the parts caused to vibrate by the affection, that of the strings; for it is not the harmony, but the string that experiences the affection; and even if the musician desired it, the string would not vibrate unless it were prescribed by the harmony.