[149] for all things which are devoid and destitute of wisdom are mischievous, just as all places upon which the sun does not shine are of necessity dark; for it is by virtue that a farmer is able to pay better attention to his crops, and by virtue that a charioteer drives his chariot in the horse-races so as to avoid falling; and by virtue too, that a pilot and a steersman guides his vessel in its voyage.