II. The brave, outspoken tone of this sermon evidences the power and influence of the Holy Spirit upon St. Peter's mind. St. Chrysostom, in his famous lectures on the Acts of the Apostles, notes the courageous tone of this address as a clear evidence of the truth of the resurrection. This argument has been ever since a commonplace with apologists and expositors, and yet it is only by an effort that we can realize how very strong it is. Here was St. Peter and his fellow Apostles standing up proclaiming a glorified and ascended Messiah. Just seven weeks before, they had fled from the messengers of the High Priest sent to arrest their Master, leaving Him to His fate. They had seen Him crucified, knew of His burial, and then, feeling utterly defeated, had as much as possible withdrawn themselves from public notice. Seven weeks after, the same band, led by St. Peter, himself a short time before afraid to confess Christ to a maidservant, boldly stand up, charge upon the multitude, who knew all the circumstances of Christ's execution, the crime of having thus killed the Prince of Life, and appeal to the supernatural evidence of the gift of tongues, to which they had just listened, as the best proof of the truth of their message. St. Peter's courage on this occasion is one of the clearest proofs of the truth of his testimony. St. Peter was not naturally a courageous man. He was very impulsive and very sympathetic. He was the creature of his surroundings. If he found himself in the midst of Christ's friends, he was the most forward to uphold Christ's cause, but he had not much moral stamina. He was sadly deficient in staying power. His mind was very Celtic in its tone, to draw an illustration from national characteristics. The Celtic mind is very sympathetic, ardent, enthusiastic. It is swept along in moments of excitement, either of victory or of defeat, by the dominating power of numbers. How often has this quality been manifested by the French people, for instance? They are resistless when victorious; they collapse utterly and at once when defeated. St. Peter was just the same. He was sympathetic, ardent, enthusiastic, and fell, in later as well as in earlier age, into the perils which attend such temperaments. He denied his Master when surrounded by the menials of the high priest. He was ready to die for that Master a few hours before, when sitting surrounded by Christ's disciples in the secrecy of the upper room. Divine grace and the baptism of the Spirit did not at all change his natural character in this respect. Divine grace, whether granted in ancient or in modern times, does not destroy natural character, which is God's gift to man. It merely refines, purifies, elevates it. We find, indeed, a striking illustration of this law of the Divine life in St. Peter's case.