I wouldn't say that it's about depravity, simply (Notes from the Underground, even, is more specifically concerned with honesty and hypocrisy and self-awareness). There's obviously a lot of other things in Russian literature. Levin's happiness the night he proposes, for instance, is not simply about depravity, and the end of Crime and Punishment certainly sounds a note of restrained hope. And there's a lot of value in it; all I'm saying is that the specific quality which I think is most (not uniquely) helpful in making our imaginations Christian is not the keynote. It's not the keynote in Shakespeare, either, or in George Orwell, or Katherine Mansfield (though she might come closer to a secular version of it than anyone else) or even in ecclesiastical writers like Donne, so its absence isn't necessarily a bad thing.