-in the speaker’s tone. "Had I known of these sources ten years ago," he was saying, "much of my work in optics would have been unnecessary." Ahha! thought the abbot, so that’s it. Or at least part of it. He’s finding out that some of his discoveries are only rediscoveries, and it leaves a bitter taste. But surely he must know that never during his lifetime can he be more than a recoverer of lost works; however brilliant, he can only do what others before him had done. And so it would be, inevitably, until the world became as highly developed as it had been before the Flame Deluge.