The first parable sets forth the obstacles encountered in the soil itself. Sometimes the seed falls on _hard soil_, where it cannot penetrate the surface, and presently birds come and carry it away--representing those hearers of the word, who, though they remember it for a short time, have their hearts hardened against it, so that it does not enter, but is presently snatched away by trifling worldly thoughts which come fluttering into the mind. Then there is the _shallow soil_, a little loose earth on the surface, and close under it the hard rock, harder even than the trodden wayside--a kind of soil in which the seed will rapidly take root and spring up, and as rapidly wither away in the noonday heat, and which therefore fitly represents those who are easily impressed, but whose impressions do not last; who make many resolutions indeed, but in so half-hearted and impulsive a way that they are destined to be blighted by the first blast of temptation. Finally, there is the _preoccupied soil_, where thorns and thistles hold the ground and choke the springing plants of grace, representing those who "are choked with cares, and riches and pleasures of this life, and bring no fruit to maturity." The _good soil_ is marked by characteristics which are simply the negatives of these: it is not hard, so the seed enters; not shallow, so it takes root; not preoccupied, so it holds the ground, and springs up and brings forth fruit, "in some thirty, in some sixty, in some a hundredfold." There are, however, other obstacles than those found in the nature of the soil. There is the diligence of the enemy, and the impossibility of getting rid of those who have come under his influence, as set forth in the second parable, that of "The Tares of the Field." In this parable the good seed is no longer the word, but "the children of the kingdom"; as if to suggest that Christians themselves are to be to the world what the word has been to them; while the bad seed--sown when men sleep, sown when Christians are asleep--does not remain as mere seed, but embodies itself in "children of the wicked one," who take their places side by side with the true children of the kingdom, and whom it is so difficult to distinguish from them, that the separation may not be attempted till the time of the harvest, when it shall be complete and final, and "the righteous shall shine forth as the sun in the kingdom of their Father."