30 He also said, "With what can we compare the kingdom of God, or what parable will we use for it? 31 It is like a mustard seed, which, when sown upon the ground, is the smallest of all the seeds on earth; 32 yet when it is sown it grows up and becomes the greatest of all shrubs, and puts forth large branches, so that the birds of the air can make nests in its shade."
33 With many such parables he spoke the word to them, as they were able to hear it; 34 he did not speak to them except in parables, but he explained everything in private to his disciples.
Matthew Henry's Commentary on Mark 4:30-34
Commentary on Mark 4:21-34
(Read Mark 4:21-34)
These declarations were intended to call the attention of the disciples to the word of Christ. By his thus instructing them, they were made able to instruct others; as candles are lighted, not to be covered, but to be placed on a candlestick, that they may give light to a room. This parable of the good seed, shows the manner in which the kingdom of God makes progress in the world. Let but the word of Christ have the place it ought to have in a soul, and it will show itself in a good conversation. It grows gradually: first the blade; then the ear; after that the full corn in the ear. When it is sprung up, it will go forward. The work of grace in the soul is, at first, but the day of small things; yet it has mighty products even now, while it is in its growth; but what will there be when it is perfected in heaven!