Learn from the mistakes of others

whilst reading wintrmute, i came across this interesting quote:

Because you can't tell a great hacker except by working with him, hackers themselves can't tell how good they are. This is true to a degree in most fields. I've found that people who are great at something are not so much convinced of their own greatness as mystified at why everyone else seems so incompetent. The people I've met who do great work rarely think that they're doing great work. They generally feel that they're stupid and lazy, that their brain only works properly one day out of ten, and that it's only a matter of time until they're found out.

From: http://www.paulgraham.com/gh.html

i can relate to this quote. does anyone else?

and just as importantly, does anyone else think this relates to me?