Once, when he had fallen asleep, he dreamed a dream from which he awoke with a cry of terror. In his dream he had seen an evil spirit (it had the appearance of a man, but he knew it to be an evil spirit because of the infinitely evil joy which shone through the melancholy of its eyes), and he was sitting talking with the evil spirit on the edge of a tall cliff above the sea; and it said to him: Do you know that Seaward Lackland is damned? and he said No, and it said: He is damned because he has sinned the sin against the Holy Ghost; and the evil joy began to grow and grow in its eyes, and it was watching him as if to discover whether he knew that he himself was Seaward Lackland, and he tried to say No again, more loudly, and as he drew back, the cliff began to crumble away, but very slowly, so that a hundred years might have passed while he felt himself slipping down into the gulf of the sea; and his own cry awakened him. He knew that he had been dreaming, but the dream might have been a message. He knew the text in the Bible, and he had often wondered what it meant. Had not Jesus said: 'All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men'? It was the most terrible saying in the Bible. What was the sin which even God could not forgive? He remembered that reiteration in Matthew: 'And whosoever speaketh a word against the Son of Man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, nor in the world to come.' Might it not be possible for a man to sin that sin in ignorance? Would his ignorance avail him, if he had actually sinned it? These thoughts troubled him strangely, and he tried to put them away from him. They came back to him again, and more searchingly. Since his conversion he had been as much troubled by the thought of his past sins as he had been before that change occurred. They were put away; yes, but was it not a kind of putting off the payment of a debt which might be still accumulating? And now, if there was one sin which could never be atoned for, and if he had committed that one sin? It was possible, and the thought filled him with horror. One July night, when the boats were away in the North Sea, he set himself to think the whole matter out; he would get at the truth, and not endure this doubt and trouble any longer. He was sitting in the stern of the boat, the other men were talking in low voices, but he was used not to hear them. He put his elbows on his knees, and bowed his head over till his hands met above it. He shut his eyes and stared hard into the darkness under his eyelids. The boat rocked gently: he wanted to keep quite still, so that he might think, and he put his feet against the sides of the boat, steadying himself.