Which book(s) was so good that it ruined the rest of literature for you?

I'm curious what others will say, selfishly because this happened to me and I'm looking for equally great books to restore my love for literature.

Proust's In Search of Lost Time completely ruined the rest of literature for me. I'm not even fully done with the entire book series and I feel this way. I would normally look at such an epic 6-volume series nervously like a huge commitment, but now I look at it like a giant ice cream sundae for my soul that I hope I can never finish because I never want it to end.