[142] [cap.28] Last of all, the divine legislator prohibits covetousness, knowing that desire is a thing fond of revolution and of plotting against others; for all the passions of the soul are formidable, exciting and agitating it contrary to nature, and not permitting it to remain in a healthy state, but of all such passions the worst is desire. On which account each of the other passions, coming in from without and attacking the soul from external points, appears to be involuntary; but this desire alone derives its origin from ourselves, and is wholly voluntary.