It takes something more than intelligence to act intelligently.

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.

Intelligence alone is not nearly enough when it comes to acting wisely.

The more stupid one is, the closer one is to reality. The more stupid one is, the clearer one is. Stupidity is brief and artless, while intelligence squirms and hides itself. Intelligence is unprincipled, but stupidity is honest and straightforward.

Oh, gentlemen, perhaps I really regard myself as an intelligent man only because throughout my entire life I've never been able to start or finish anything. Granted, granted I'm a babbler, a harmless, irksome babbler, as we all are. But what's to be done if the sole and express purpose of every intelligent man is babble--that is, a deliberate pouring from empty into void.

You become an intelligent person, not because of the knowledge you get but because of how you use it.