"A sin is heinous, not in itself, but in relation to the level of virtue habitually maintained by whoso commits it. And so, even were I not disabled, were I still capable of carrying out these investigations, the unsparing prosecution of which could alone give proof of the sincerity of my repentance, that could not really wipe out the iniquity of the past. In morals I cannot logically admit the possibility of cancelling a wrong once done. In the realm of physics we know that vibrations, once generated, ring out everlastingly through space. To send forth a contrary set of vibrations is not to limit, or cause the first generated to cease. Their circles may intersect, yet they are practically independent, and cannot neutralise one another. In the realm of morals it is the same. The act once committed passes into the region of persistent and indubitable fact. Of sins, both passive and active, this is equally true. And consequently I am doomed--so long as I retain conscious individuality--to remain hopelessly lowered in my self-esteem." The sick man spoke with a fierceness of conviction, his voice usually low and even swelling into full sonorous tones; his attenuated frame vibrant with energy; his face illuminated, as though a lamp burned behind that thin investiture of flesh and bone. Laurence saw in him, for the moment, a great orator, more probably a great preacher, wasted. And the thought of that waste of force, waste of power, stung him out of indolence, out of mere easy good nature. He, at least, would shilly-shally no more with life, but play the game--whatever the game presenting itself--whole-heartedly. And again that queer shiver of excitement ran through him; while again he reminded himself he had now reliable testimony that he had met with something far stranger, more incalculable and mysterious, than any vision of a dream, in that clear-coloured room downstairs last night. He stood silent, thinking intently, feeling keenly, his whole nature alert. But a small rustling sound, as of a chill wind among dry leaves in a winter hedge, recalled him to his immediate surroundings. Mr. Rivers had sunk back against the silken cushions, which rustled under his weight. The light had died out of his face, his hands clutched tremblingly at the crystal _memento mori_ resting on his knees. For the first time Laurence realised how very near--but for the indomitable strength of will which supported him--he was to death. Laurence bent over him. "This is heavy, sir," he said, touching the crystal skull. "May I put it back on the table?" Mr. Rivers bowed his head in assent. "We have talked too much. It would be wise, I think, for me to leave you." "It would be so." "May I call your man before I go--I hardly like to leave you alone." "Thank you; he will come at the accustomed hour. I do not deviate from habits once formed except under stress of necessity."