Matthew 13:42 Jesus often uses these terms to refer to the coming judgment. The wailing indicates sorrow or remorse, and gnashing of teeth shows extreme anxiety or pain. Those who say they don't care what happens to them after they die don't realize what they are saying. They will be punished for living in selfishness and indifference to God.
Matthew 13:44-46 The kingdom of heaven is more valuable than anything else we can have, and a person must be willing to give up everything to obtain it. The man who discovered the treasure in the field stumbled upon it by accident but knew its value when he found it. The merchant was earnestly searching for the pearl of great value, and, when he found it, he sold everything he had to purchase it.
Matthew 13:47-49 The parable of the dragnet (fishing net) has the same meaning as the parable of the wheat and tares. We are to obey God and tell others about His grace and goodness, but we cannot dictate who is part of the kingdom of heaven and who is not. This sorting will be done at the Last Judgment b those infinitely more qualified than we.
Matthew 13:52 Anyone who understands God's real purpose in the law as revealed in the Old Testament has a real treasure. The Old Testament points the way to Jesus, the Messiah. Jesus always upheld its authority and relevance. But there is a double benefit to those who understand Jesus' teaching about the kingdom of heaven. This was a new treasure that Jesus was revealing. Both the old and new teaching give practical guidelines for faith and for living in the world. The religious leaders, however, were trapped in the old and blind to the new. They were looking for a future kingdom preceded by judgment. Jesus, however, taught that the kingdom was now and the judgment was future. The religious leaders were looking for a physical and temporal kingdom (via military rebellion and physical rule), but they were blind to the spiritual significance of the kingdom that Christ brought.