The parable of the "tares and the wheat" introduces the two seeds, the good and the bad, the diverse contents of the present age or world-Christendom.
The parables of the "mustard seed" and the "leaven," take up the "tares," presenting them, the bad thing of Christendom, in its two forms of outward, secular greatness and of internal, spiritual corruption.
The parables of the "treasure" and the "pearl," in like manner, take up the wheat, presenting it, the good thing of Christendom, in its two characters, as being set for Christ's glory and for Christ's joy or delight.
The parable of the "drag net" shows the separating, judicial action that is to close the age.
No doubt "the kingdom of heaven" when set up hereafter (in millennial day), will comprise Jews, Gentiles and the Church of God (1 Cor. 10:3232Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God: (1 Corinthians 10:32)), this last in heavenly glory.
The tares and the wheat are generating, so to speak, the rest. For it includes the bad thing, and the good thing and the judgment that finally separates these two things. And thus the last five parables are only an enlarged view of the contents of this parent-parable, giving us what was presented there, in deeply affecting, solemn and precious characteristics.