Wicked - Gregory Maguire

Elphie: Do you even believe in other worlds?
Sarima: I find it a great effort to believe in this one, yet it seems to be here, so why should I trust my skepticism about other worlds? Don't you believe?
Elphie: I tried to, as a child. I made an effort. The mothy, gormless, indistinct sunrise of salvation world - the Other Land - I couldn't get it, I couldn't focus. Now I just think it's our own lives that are hidden from us. The mystery - who is that person in the mirror -that's shocking and unfathomable enough for me.