What does Mark 4:15 mean?
In Mark 4:14–20, Jesus explains the spiritual meaning behind the symbolism of the parable of the sower (Mark 4:1–9). As a sower sows seeds, some lands on the hard path and is quickly eaten by birds (Mark 4:4). The birds represent Satan who steals God's truth before it gets a chance to break through the tough shell of hardened hearts. First Peter 5:8 describes Satan as a lion who doesn't just steal truth, he devours lives. Often, those lives are destroyed by lies.In Genesis 3, Satan deceived Eve into sinning against God, resulting in the human-wide curse of an inherited sin nature. In Mark 8:32–33, Peter bends to Satan's lie that Jesus cannot die, and then tries to prevent Jesus from fulfilling His mission. In our lives, Satan's lies appear in false religions, misinterpretations of God's character, and the belief that we need worldly things more than God's Word.
In the parable of the sower, Satan snatches the gospel away before it can save lives. What could be a harvest of one hundred-times the initial investment remains a hard heart, calloused to God's love. The Pharisees and Herodians display this hard-heartedness (Mark 3:6, 22).
As with the other examples of soils, it's possible for Satan to block God's truth in one area while we accept the message in another. All of us have strengths and weaknesses; we may be very generous with our time and resources (Mark 12:41–44) but still have anxiety about spreading the gospel (Mark 13:11). God desires us to be mature in all areas of our spiritual walk (Matthew 5:48) and has given us the Bible for that purpose (2 Timothy 3:16).
Mark 4:10–20 follows Jesus' telling of the parable of the sower, and now and the disciples would like to understand the deeper truths in the story. Jesus made a habit of explaining parables to those who wanted to know more than the general crowd. The fact that they are curious proves that they are the good soil that will produce much fruit. Jesus explains how the growth of the seeds represent why people react differently to His message (Mark 3). The subsequent parables will go deeper into what it will take for the gospel to spread successfully. You can also find this account in Matthew 13:10–23 and Luke 8:9–15.
Jesus speaks in parables to the assembled crowd, giving them an opportunity to decide how much spiritual truth they want to absorb. The disciples, wanting to learn more, ask Jesus to explain the meaning of the parables He has taught. As Jesus explains these ideas, He demonstrates that a person's spiritual knowledge is based on their willingness to pursue truth. After describing Jesus' teaching in some detail, the Gospel of Mark describes how Jesus calms a storm on the Sea of Galilee.