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Nabokov, though talented, was envious and, at one time, called Fyodor Mikhailovich the author of cheap detective stories (I don't remember the exact quote) - I've never heard anything more absurd in my life.
Ah, here it is:
While Tolstoy could afford to spend many years writing novels, Dostoevsky was forced to write novels in a year. Undeniable talent is present, but there's also a sense of being cornered and despair.