Whose wish?

"'I see,' said John, 'But what was the second interpretation?'
'In the second,' said Reason, 'the bridge signifies the giant's own favorite doctrine of the wish-fulfillment dream. For this he also wishes to use and not to use.'
'I don't see how he wishes not to use it'
'Does he not keep on telling people that the Landlord is a wish-fulfillment dream?'
'Yes. Surely that is true- the only true thing he did say.'
'Now, think. Is it really true that the giant and Sigismund, and the people in Eschropolis, and Mr. Halfways, are going about filled with a longing that there should be a Landlord, and cards of rules, and a mountain land beyond that brook, with a possibility of a black hole?'
Then John stood still in the road to think. And first he gave a shake of his shoulders, and then he began to laugh until he was almost shaken to pieces. And when he had nearly finished, the vastness and impudence and simplicity of the fraud which had been practiced came over him all again, and he laughed harder. And just when he had nearly recovered and was beginning to get his breath again, suddenly he had a picture in his mind of Victoriana and Glugly and Gus Halfways and how they would look if a rumour reached them that there was a Landlord and he was coming to Eschropolis. This was too much for him, and he laughed so hard that the broken chains of the Spirit of the Age fell off his wrists altogether. But all the while Reason sat and watched him
'You had better hear the rest of the argument,' she said at last, 'It may not be such a laughing matter as you suppose.'
'Oh yes- the argument, said John, wiping his eyes.
'You see now the direction in which the giant does not want the wish-fulfillment theory used?'
'I'm not sure that I do,' said John.
'Don't you see what follows if you adopt his own rules?'
'No,' said John very loudly: for a terrible apprehension was stealing over him.
'But you must see,' said Reason, 'that for him and all his subjects disbelief in the Landlord is a wish-fulfillment dream.'
'I shall not adopt his rules.'
'You would be foolish not to have profited at all by your stay in his country,' said Reason, 'There is some force in the wish-fulfillment doctrine.'
'Some, perhaps, but very little.'
'I only wanted to make it clear that whatever force it had was in favour of the Landlord's existence, not against it- specially in your case.'
'Why specially in mine?' said John sulkily.
'Because the Landlord is the thing you have been most afraid of all your life. I do not say that any theory should be accepted because it is disagreeable, but if any should, then belief in the Landlord should be accepted first.'" C.S. Lewis, The Pilgrim's Regress, Book 4, Chapter IV