Comment by vannevar

I think you're missing the point of his argument. It isn't that we don't know anything, or that we cannot know anything. It is simply that people who are successful do not know how they became successful. Even the work of someone like Einstein is subject to the vagaries of chance; it's entirely possible that had he not been inspired by some trivial incident in his life, he might never have had the insight that led to relativity. The author may overstate the argument, but his fundamental point is sound.