Book 1
20
Again, what subjects of contemplation belong to prudence? Good and evil, and that which is indifferent. What, then, is prudence itself? Good. What imprudence? Evil.
20
You see, then, that it necessarily contemplates both itself and its contrary. Therefore, the first and greatest work of a philosopher is to try to distinguish the phenomena of existence, and to admit none untried. Even in money, where our interest seems to be concerned, you see what an art we have invented, and how many ways an assayer uses to try its value,—by the sight, the touch, the smell, and, lastly, the hearing. He throws the piece down, and attends to the jingle; and is not contented with its jingling only once, but, by frequent attention to it, trains his ear for sound. So, when we think it of consequence whether we are deceived or not, we use the utmost attention to discern those things which may deceive us. But, yawning and slumbering over our poor neglected reason, we are imposed upon by every appearance, nor know the mischief done. Would you know, then, how very languidly you are affected by good and evil, and how vehemently by things indifferent, consider how you feel with regard to bodily blindness, and how with regard to being deceived; and you will find that you are far from being moved, as you ought, in relation to good and evil.
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But trained powers and much labor and learning are here needed.
