“Be careful what you hear: in the measure you use, it will be measured to you and added to you who hear; and whoever has, it will be given to him; and whoever does not have, even what he thinks he has, will be taken away from him.” Knowledge increases for those who are diligent; for those who lack diligence and understanding, what they believe they possess will be taken from them, as noted by Blessed Theophylact.
At the end of this discourse, the Lord sought to ensure clarity for His disciples by asking, “Do you understand all these things?” When they affirmed, “Yes, Lord!” He then offered a brief parable to illustrate that they should put into practice the wisdom they had gained regarding the Kingdom of God, comparing them to a householder who utilizes both old and new items. “Every scribe trained for the kingdom of heaven is like a householder who brings out of his treasure what is new and what is old.” Through their understanding of the mysteries of the Kingdom, the Apostles became scribes in a renewed and superior manner compared to their Jewish counterparts, sharing with the people the teachings of Christ and “wearing out,” as Blessed Theophylact describes, both the old and the new law. They were to affirm the old with the new while expanding and elucidating the old, all aimed at the singular purpose of advancing and establishing Christ's gracious Kingdom on earth.