XXI. (94) To these men the law-giver says were given, "Great and beautiful cities, which they had not built; houses full of good things, which they had not filled; cisterns cut out of the solid rock, which they had not hewn; vineyards and olive gardens, which they had not planted."23 (95) Now, by cities and houses, he here symbolically sketches out the generic and specific virtues; for genus resembles a city, because it is marked out in larger circumferences, and because it is common to many individuals; and species resembles a house, because it is more contracted and avoids community; (96) and cisterns prepared before-hand intimate the rewards which fall to the lot of some for their labour, while they are given spontaneously to others, being channels of heavenly and wholesome waters and well prepared treasures for the preservation of the virtues before mentioned, by means of which joy is shed over the perfect heart, irradiating it all over with the light of truth. Again, when Moses speaks of the vineyards, he means them as an emblem of cheerfulness, and the olive gardens as a symbol of light. (97) Happy, therefore, are they who, suffering something like those persons who awoke up out of deep sleep, on a sudden, without any labour or exertion on their part, behold the world before them; and miserable are they to whom it happens to be eagerly contentious for objects to which they are not fitted by nature, being full of a contentious spirit, which is the most grievous of diseases. (98) For, in addition to failing in the object which they are desirous of attaining, they do further incur great disgrace with no slight injury, like ships which are attempting to make their way by sea against opposing winds; for they, in addition to being unable to proceed in their course towards the point to which they are hastening, are very often upset with their crews and their cargoes, and so cause pain to their friends and pleasure to their enemies.