You would think that after 35+ years of daily Mass, I would stop being surprised by the unexpected connections between the Mass readings. Another one came popping out at me today.
In the first reading, Paul (in prison) is exhorting Timothy to stick to his guns, and above all to remember the Scriptural message he had imbibed from childhood, because "all Scripture is inspired by God and useful for teaching, refutation, correction and training in righteousness."
In the Gospel, Jesus gives a demonstration of just what Paul meant. He raises an innocent question: "Why do the scribes claim that the Messiah is the son of David?" Then he "refutes" the most obvious interpretation of that belief by bringing in the Scriptures: "David himself calls the Messiah 'Lord' when--inspired by the Holy Spirit-- he writes [in the Psalm], 'The Lord said to my Lord, "Sit at my right hand".' " Using the Scriptures (and highlighting their inspired character), Jesus reveals that there is much more going on in the Messianic prophecies than anyone could have suspected.
That must have been an ongoing experience in the early Church: going back to the old, old writings in the Law, Prophets and Psalms and, with a start, recognizing that in a mysterious way, Jesus had been there all along. By reading the Scriptures of Israel, the first generation of Christians came to know Jesus even better. And of course, so can we.