Joseph Benson's Commentary of the Old and New Testaments - Luke 13:18-21
Luke 13:18-21. Then said he, Unto what is the kingdom of God like? After the Lord had thus silenced the ruler of the synagogue, and while he observed the rejoicings of the people, he reflected with pleasure on the reason and truth which so effectually supported his kingdom. For he delivered a second time the parables of the grain of mustard-seed, and of the leaven, to show the efficacious operation of the gospel upon the minds of men, and its speedy propagation through the world in spite of... read more
Albert Barnes' Notes on the Whole Bible - Luke 13:18-21
See these parables explained in the notes at Matthew 13:31-32. read more