Fyodor Dostoyevsky said this quote

“ One of the characters in our story, Gavril Ardalionovitch Ivolgin, belonged to the other category; he belonged to the category of much cleverer people; though head to toe he was infected with the desire to be original. But this class of person, as we have observed above, is far less happy than the first. The difficulty is that the intelligent ordinary man, even if he does imagine himself at times (and perhaps all his life) a person of genius and originality, nevertheless retains within his heart a little worm of doubt, which sometimes leads the intelligent man in the end to absolute despair. If he does yield in this belief, he is still completely poisoned with inward-driven vanity. ”