Seed falling in shallow soil, underlain by a floor of unbroken stone or hard-pan, may strike root and flourish for a brief season; but as the descending rootlets reach the impenetrable stratum they shrivel, and the plant withers and dies, for the nutritive juices are insufficient where there is no depth of earth.[619] So with the man whose earnestness is but superficial, whose energy ceases when obstacles are encountered or opposition met; though he manifest enthusiasm for a time persecution deters him; he is offended,[620] and endures not. Grain sown where thorns and thistles abound is soon killed out by their smothering growth; even so with a human heart set on riches and the allurements of pleasure--though it receive the living seed of the gospel it will produce no harvest of good grain, but instead, a rank tangle of noxious weeds. The abundant yield of thorny thistles demonstrates the fitness of the soil for a better crop, were it only free from the cumbering weeds. The seed that falls in good deep soil, free from weeds and prepared for the sowing, strikes root and grows; the sun's heat scorches it not, but gives it thrift; it matures and yields to the harvester according to the richness of the soil, some fields producing thirty, others sixty, and a few even a hundred times as much grain as was sown. Even according to literary canons, and as judged by the recognized standards of rhetorical construction and logical arrangement of its parts, this parable holds first place among productions of its class. Though commonly known to us as the Parable of the Sower, the story could be expressively designated as the Parable of the Four Kinds of Soil. It is the ground upon which the seed is cast, to which the story most strongly directs our attention, and which so aptly is made to symbolize the softened or the hardened heart, the clean or the thorn-infested soil. Observe the grades of soil, given in the increasing order of their fertility: (A) the compacted highway, the wayside path, on which, save by a combination of fortuitous circumstances practically amounting to a miracle, no seed can possibly strike root or grow; (B) the thin layer of soil covering an impenetrable bed-rock, wherein seed may sprout yet can never mature; (C) the weed-encumbered field, capable of producing a rich crop but for the jungle of thistles and thorns; and (D) the clean rich mold receptive and fertile. Yet even soils classed as good are of varying degrees of productiveness, yielding an increase of thirty, sixty, or even a hundred fold, with many inter-gradations.