[6] The cause now of behaving foolishly is a mischievous ignorance; I mean by this expression, not an ignorance of such things as are matters of instruction but an alienation from, and dislike of knowledge. The cause again of insensibility is a treacherous and mutilated ignorance. The cause of insatiability is a most grievous appetite for the indulgence of the passions of the soul. The cause of cheerfulness is at once the acquisition and the employment of virtue. Of nakedness there are many causes—an ignorance of such things as are opposite to one another; complete innocence and simplicity of manners; truth, which strips off all the coverings of such things as are concealed, on the one side revealing virtue to our eyes, and on the other side, in its turn, uncovering vice;