13:31-35 The scope of the parable of the seed sown, is to show that the beginnings of the gospel would be small, but its latter end would greatly increase; in this way the work of grace in the heart, the kingdom of God within us, would be carried on. In the soul where grace truly is, it will grow really; though perhaps at first not to be discerned, it will at last come to great strength and usefulness. The preaching of the gospel works like leaven in the hearts of those who receive it. The leaven works certainly, so does the word, yet gradually. It works silently, and without being seen, Mr 4:26-29, yet strongly; without noise, for so is the way of the Spirit, but without fail. Thus it was in the world. The apostles, by preaching the gospel, hid a handful of leaven in the great mass of mankind. It was made powerful by the Spirit of the Lord of hosts, who works, and none can hinder. Thus it is in the heart. When the gospel comes into the soul, it works a thorough change; it spreads itself into all the powers and faculties of the soul, and alters the property even of the members of the body, Ro 6:13. From these parables we are taught to expect a gradual progress; therefore let us inquire, Are we growing in grace? and in holy principles and habits?
39. The enemy that sowed them is the devil—emphatically "His enemy" (Mt 13:25). (See Ge 3:15; 1Jo 3:8). By "tares" is meant, not what in our husbandry is so called, but some noxious plant, probably darnel. "The tares are the children of the wicked one"; and by their being sown "among the wheat" is meant their being deposited within the territory of the visible Church. As they resemble the children of the kingdom, so they are produced, it seems, by a similar process of "sowing"—the seeds of evil being scattered and lodging in the soil of those hearts upon which falls the seed of the world. The enemy, after sowing his "tares," "went his way"—his dark work soon done, but taking time to develop its true character.
The harvest is the end of the world—the period of Christ's second coming, and of the judicial separation of the righteous and the wicked. Till then, no attempt is to be made to effect such separation. But to stretch this so far as to justify allowing openly scandalous persons to remain in the communion of the Church, is to wrest the teaching of this parable to other than its proper design, and go in the teeth of apostolic injunctions (1Co 5:1-13).
And the reapers are the angels—But whose angels are they? "The Son of man shall send forth His angels" (Mt 13:41). Compare 1Pe 3:22, "Who is gone into heaven, and is on the right hand of God; angels and authorities and powers being made subject unto him."