C. S. Lewis on Lust

This is my favorite passage of C. S. Lewis on lust. The Great Divorce is written as a dream. Some of the residents of hell take a bus trip to heaven. The protagonist meets up with a guide, George MacDonald, who explains the various encounters of the residents of heaven with the tourists from hell. The residents of heaven try to convince the tourists to stay. In the following dialog, George MacDonald explains the vignette just witnessed where an angel-like being convinces a tourist to let the angel kill the tourist's pet lizard. The pet lizard is a whispering, whimpering creature that represents lust.

"Do ye understand all this, my Son"? said the Teacher.

"I don't know about all, Sir," said I. "Am I right in thinking the Lizard really turned into the Horse?

"Aye. But it was killed first. Ye'll not forget that part of the story?"

"I'll try not to, Sir. But does it mean that everything--everything--that is in us can go on to the Mountains?"

"Nothing, not even the best and noblest, can go on as it now is. Nothing, not even what is lowest and most bestial, will not be raised again if it submits to death. It is sown a natural body, it is raised a spiritual body. Flesh and blood cannot come to the Mountains. Not because they are too rank, but because they are too weak. What is a Lizard compared with a stallion? Lust is a poor, weak, whimpering, whispering thing compared with that richness and energy of desire which will arise when lust has been killed." (pp. 103-104)

The verses MacDonald is referencing is

So is it with the resurrection of the dead. What is sown is perishable; what is raised is imperishable. It is sown in dishonor; it is raised in glory. It is sown in weakness; it is raised in power. It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual body. (1 Corinthians 15:42-44, ESV)