'We cannot but speak the things which we have seen and heard.'--ACTS iv. 20. The context tells us that the Jewish Council were surprised, as they well might be, at the boldness of Peter and John, and traced it to their having been with Jesus. But do you remember that they were by no means bold when they were with Jesus, and that the bravery came after what, in ordinary circumstances, would have destroyed any of it in a man? A leader's execution is not a usual recipe for heartening his followers, but it had that effect in this case, and the Peter who was frightened out of all his heroics by a sharp-eyed, sharp-tongued servant-maid, a few weeks after bearded the Council and 'rejoiced that he was counted worthy to suffer shame for His Name.' It was not Christ's death that did that, and it was not His life that did that. You cannot understand, to use a long word, the 'psychological' transformation of these cowardly deniers who fled and forsook Him, unless you bring in three things: Resurrection, Ascension, Pentecost. Then it is explicable. However the boldness came; these two men before the Council were making an epoch at that moment, and their grand words are the Magna Charta of the right of every sincere conviction to free speech. They are the direct parent of hundreds of similar sayings that flash out down the world's history. Two things Peter and John adduced as making silence impossible--a definite divine command, and an inward impulse. 'Whether it is right in the sight of God to hearken unto you more than unto God, judge ye. We cannot but speak the things which we have seen and heard.' But I wish to use these words now in a somewhat wider application. They may suggest that there are great facts which make silence and non-aggressiveness an impossibility for an individual or a Church, and that by the very law of its being, a Church must be a missionary Church, and a Christian cannot be a dumb Christian, unless he is a dead Christian. And so I turn to look at these words as suggesting to us two or three of the grounds on which Christian effort, in some form or another, is inseparable from Christian experience. And, first, I wish you to notice that there is-- I. An inward necessity which makes silence impossible.