There are two ways in which a farmer can increase the size of the crop he is able to produce. The first way is to acquire new land and expand the area of his crop onto it. The second way is to increase the yield of the same land by introducing new methods of agriculture. In short, he can increase the quantity of his farmland or he can improve the quality of it.

Of course, an ambitious farmer will do both. Last week, we looked at the fact that Jesus rejects those who are outsiders, who aren’t truly his disciples. This week, we’ll see how ambitious Jesus really is when it comes to growing his followers and expanding his kingdom. Jesus goes for both quality of disciples and quantity.

Jesus picks up right where he left off with the parable of the four soils. He had been talking about how outsiders are ignorant when it comes to God’s kingdom—this is God’s judgment on them. Insiders, on the other hand, are characterized by “fruit-bearing,” or the marks of a disciple. In Mark’s gospel, so far, disciples are identified as people who are with Jesus and who imitate Jesus. He explains why disciples are guaranteed to grow, using two illustrations.

First, Jesus asks what the purpose of lighting a lamp is. Is it lit so that its light may be hidden, or is it lit so that its light may reveal what is hidden? Obviously, it’s the latter. In the same way, the gospel message that Jesus brings is intended to reveal the truth about God and his work in the world. While it may be hidden from the blind and deaf outsiders (verse 12), it will certainly reveal truth to attentive insiders, who have “ears to hear.” That is its purpose.

Second, Jesus shows that his disciples will be given more and more understanding. “With the measure you use, it will be measured to you, and still more will be added to you,” he promises. “For to the one who has, more will be given.” He will reward his followers, who are eager to know him and to understand his message. Jesus will give them exactly what they are looking for and more! He will overwhelm them with blessing. But he also warns, “From the one who has not, even what he has will be taken away.” There will be fake disciples who have a loose grasp on who Jesus is and what he is doing. These outsiders will not be blessed with insight but will become even more spiritually dull than they were before.

Now that Jesus has established the fact that his individual followers will grow in knowledge, he launches into two parables describing how his kingdom will grow in general. The first parable tells the story of a farmer who sows seed and watches as it grows over time by itself. He does nothing to make it grow; he is mystified by how it can produce a crop. All he does is sit back and wait for the harvest. So we see that when Jesus’ gospel message is spoken and believed, it produces growth in the lives of many people. This growth comes from God; it’s not something that the speaker can produce. In other words, you and I can’t change other people’s hearts! All we can do is tell them the good news and let the Holy Spirit do his work in his timing. The kingdom grows gradually and mysteriously. With each passing day and month and year, Jesus’ disciples begin to recognize his reign over them and respond to him as their King. They produce fruit that identifies them as insiders.

The second parable describes the kingdom as a tiny mustard seed that grows into an enormous, tree-like mustard plant which towers over all the other garden plants. In other words, the kingdom may start small, but it gets big, like a snowball rolling down a hill. It may seem unimpressive now, but it won’t stay that way for long. Jesus may only have a few followers now, but they will grow in number, until his kingdom has expanded to fill the whole earth with the glory of the Lord. With the seed of his gospel message, Jesus will grow God’s kingdom into a powerful worldwide movement.

Let’s stop to consider the implications for you and me. What this means is that real disciples will always bear the marks of insiders. They will produce fruit, being with Jesus and imitating him. They will be growing continually. The gospel message, to them, is not a one-time decision that they leave in the past. They do not simply “pray a prayer” and move on. No! The gospel is the source of their growth, and they return to it day by day so they will not become stagnant. They grow through the power of the Holy Spirit. They grow in godliness and influence, extending Jesus’ gospel message to a world that needs to hear it.

Mark wraps up his account of Jesus’ parables by telling us that Jesus is only speaking to the crowd in parables now. He is hiding his gospel message from outsiders. He is only explaining the parables to insiders. So which group do you belong to? Are you an outsider, either consciously or unconsciously opposing Jesus? Perhaps you call yourself a Christian, but you’ve deceived yourself for many years; you’ve never understood the gospel and never been a part of God’s kingdom. Or are you an insider, slowly learning and growing as the Lord mysteriously transforms your heart? If you truly are a disciple of Jesus, you will learn and change and grow, because Jesus loves his followers, and he always makes sure that they will grow.

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