What does it mean that the one who has will be given more while the one who has not will have what he has taken away?

Those who have (Matthew 13:12) are those who are found open and receptive to the truth of the gospel, and who have made the truths it proclaims their own, just as the first disciples did. These believers will be abundantly rewarded. Those who have not are the Jews, which by an outwardly and merely apparent religious knowledge have closed their hearts off to the truth. Even what little they have will be taken away from them. As such, speaking in parables is a punishment for unbelievers, but a reward for the disciples, who are being led ever deeper into the knowledge of the secrets of the kingdom of God. In this way Jesus fulfills the will of God spoken of in Matthew 13:11. It is also a spiritual law that he who uses the gifts of God in the right way, and keeps in his heart the light and the grace that he has received, will receive even more from the Lord. But those who neglect their opportunities and have no love for the truth, from them will be taken away even what little they have.¹