Another question had been pressing the Apostle's mind, and that for years, but recently with a special weight. It was the mystery of Jewish unbelief. Who can estimate the pain and greatness of that mystery in the mind of St Paul? His own conversion, while it taught him patience with his old associates, must have filled him also with some eager hopes for them. Every deep and self-evidencing manifestation of God in a man's soul suggests to him naturally the thought of the glorious things possible in the souls of others. Why should not the leading Pharisee, now converted, be the signal, and the means, of the conversion of the Sanhedrin, and of the people? But the hard mystery of sin crossed such paths of expectation, and more and more so as the years went on. Judaism outside the Church was stubborn, and energetically hostile. And within the Church, sad and ominous fact, it crept in underground, and sprung up in an embittered opposition to the central truths. What did all this mean? Where would it end? Had Israel sinned, collectively, beyond pardon and repentance? Had God cast off His people? These troublers of Galatia, these fiery rioters before the tribunal of Gallio at Corinth, did their conduct mean that all was over for the race of Abraham? The question was agony to Paul; and he sought his Lord's answer to it as a thing without which he could not live. That answer was full in his soul when he meditated his Letter to Rome, and thought of the Judaists there, and also of the loving Jewish friends of his heart there who would read his message when it came.