The greater the artist, the greater the doubt. Perfect confidence is granted to the less talented as a consolation prize.
We all learn best in our own ways. Some people do better studying one subject at a time, while some do better studying three things at once. Some people do best studying in structured, linear way, while others do best jumping around, surrounding a subject rather than traversing it. Some people prefer to learn by manipulating models, and others by reading.
Failure, then, failure! so the world stamps us at every turn. We strew it with our blunders, our misdeeds, our lost opportunities, with all the memorials of our inadequacy to our vocation. And with what a damning emphasis does it then blot us out! No easy fine, no mere apology or formal expiation, will satisfy the world's demands, but every pound of flesh exacted is soaked with all its blood. The subtlest forms of suffering known to man are connected with the poisonous humiliations incidental to these results.