I love this.
This is from The Great Divorce by C.S. Lewis
In  his story, he and some others were on a bus trip that took them to  the  outskirts of heaven.  There, they are able to get a glimpse of true   reality - about heaven and themselves. The people from  the bus trip are  "ghosts" and each "Ghost" has something  he must give up.
I  saw coming towards us a Ghost who carried something on his shoulder.    Like all the Ghosts, he was unsubstantial, but they differed from one   another as smokes differ.  Some had been whitish; this one was dark and   oily.  What sat on his shoulder was a little red lizard, and it was   twitching its tail like a whip and whispering things in his ear.  As we   caught sight of him he turned his head to the reptile with a snarl of   impatience.  "Shut up, I tell you!" he said.  It wagged its tail and   continued to whisper to him.  He ceased snarling, and presently began to   smile.  Then he turned and started to limp westward, away from the   mountains. 
 "Off so soon?" said a voice. 
  The speaker was  more or less human in shape but larger than a man, and  so bright that I  could hardly look at him.  His presence smote on my  eyes and on my body  too (for there was heat coming from him as well as  light) like the  morning sun at the beginning of a tyrannous summer day.  
 "Yes,  I'm off," said the Ghost.  "Thanks for  all your hospitality.  But it's  no good, you see.  I told this little  chap," (here he indicated the  lizard), "that he'd have to be quiet if  he came - which he insisted on  doing.  Of course his stuff won't do  here: I realize that.  But he won't  stop.  I shall just have to go home  
 "Would you like me to make him quiet?" said the flaming Spirit - an angel, as I now understood. 
 "Of course I would," said the Ghost. 
 "Then I will kill him," said the Angel, taking a step forward. 
 "Oh - ah - look out! You're burning me.  Keep away," said the Ghost retreating. 
 "Don't you want him killed?" said the Angel. 
 "You didn't say anything about killing him at first.  I hardly meant to bother you with something so drastic as that." 
 "It's the only way," said the Angel, whose burning hands were now very close to the lizard.  "Shall I kill it?" 
  "Well, that's a further question.  I'm quite open to consider it, but   it's a new point, isn't it?  I mean, for the moment I was only thinking   about silencing it..." said the Ghost. 
 "May I kill it?" asked the Angel. 
 "Well, there's time to discuss that later" said the Ghost. 
 "There is no time.  May I kill it?" 
  Please, I never meant to be such a nuisance.  Please - really - don't   bother.  Look!  It's gone to sleep of its own accord.  I'm sure it will   be all right now.  Thanks ever so much." 
 "May I kill it?" 
  "Honestly, I don't think there's the slightest necessity for that.  I'm   sure I shall be able to keep it in order now.  I think the gradual   process would be far better than killing it." said the Ghost. 
 "The gradual process is of no use at all." 
  "Don't you think so?  Well, I'll think over what you've said very   carefully.  I honestly will.  In fact I'd let you kill it now, but as a   matter of fact I'm not feeling frightfully well today.  It would be   silly to do it now.  I'd need to be in good health for the operation.    Some other day, perhaps." 
 "There is no other day.  All days are present now." 
 "Get back!  You're burning me.  How can I tell you to kill it?  You'd kill me if you did." 
 "It is not so." 
 "Why, you're hurting me now." 
 "I never said it wouldn't hurt you.  I said it wouldn't kill you"... 
  The Angel's hands were almost closed on the Lizard, but not quite.    Then the Lizard began chattering to the Ghost so loud that even I could   hear what it was saying. 
 "Be careful," it  said.  "He can do what  he says.  He can kill me.  One fatal word from  you and he will!  Then  you'll be without me forever and ever.  It's not  natural.  How could you  live?  You'd only be a sort of ghost, not a  real man as you are now.   He doesn't understand.  He's only a cold,  bloodless abstract thing.  It  may be natural for him, but it isn't for  us.  Yes, yes. I know there are  no real pleasures now, only dreams.   But aren't they better than  nothing?  And I'll be so good.  I admit  I've sometimes gone too far in  the past, but I promise I won't do it  again. I'll give you nothing but  really nice dreams - all sweet and  fresh and almost innocent.  You might  say, quite innocent..." 
 "Have I your permission?" asked the Angel to the Ghost. 
 "I know it will kill me." 
 "It won't.  But supposing it did?" asked the Angel 
 "You're right.  It would be better to be dead than to live with this creature." 
 "Then I may?" 
 "...Go on can't you!  Get it over.  Do what you like," bellowed the Ghost: but ended, whimpering, "God help me. God help me." 
  Next moment the Ghost gave a scream of agony such as I never heard on   Earth.  The Burning One closed his crimson grip on the reptile: twisted   it, while it bit and writhed, and then flung it, broken backed on the   turf.
What a great reminder. Satan is a LIAR and  DECEIVER. And sometimes we have to make radical choices in order to  follow Jesus. It isn't always easy and doesn't always 'feel good'. But,  it will be worth it. It will be MORE than worth it.