From The Idiot:
There is nothing so annoying as to be fairly rich, of a fairly good family, pleasing presence, average education, to be “not stupid,” kind-hearted, and yet to have no talent at all, no originality, not a single idea of one’s own—to be, in fact, “just like everyone else.”
Of such people there are countless numbers in this world—far more even than appear. They can be divided into two classes as all men can—that is, those of limited intellect, and those who are much cleverer. The former of these classes is the happier.
To a commonplace man of limited intellect, for instance, nothing is simpler than to imagine himself an original character, and to revel in that belief without the slightest misgiving… Others have but to read an idea of somebody else’s, and they can immediately assimilate it and believe that it was a child of their own brain. The “impudence of ignorance,” if I may use the expression, is developed to a wonderful extent in such cases;—unlikely as it appears, it is met with at every turn.
Our friend, Gania, belonged to the other class—to the “much cleverer” persons, though he was from head to foot permeated and saturated with the longing to be original. This class, as I have said above, is far less happy. For the “clever commonplace” person, though he may possibly imagine himself a man of genius and originality, none the less has within his heart the deathless worm of suspicion and doubt; and this doubt sometimes brings a clever man to despair.
(A description of the D-K effect here.)