Original sentence: But while Luther was absent at Wartburg Castle, during the disturbances caused by the Zwickau prophets, there appeared for the first time the limitations of Melanchthon's nature, his lack of firmness and his diffidence against these prophets, and had it not been for the energetic interference of Luther, the prophets might not have been silenced
Edited sentence: But while Luther was absent at Wartburg Castle, during the disturbances caused by the Zwickau prophets, there appeared for the first time the limitations of Melanchthon's nature, his lack of firmness and his diffidence, and had it not been for the energetic interference of Luther, the prophets might not have been silenced