"And that was it. I could do that much — but that was all. I was hopeless. My brain simply doesn’t work in a way that allows me to write code. So saying that if I’d spent ten thousand hours talking to Rax, I would be a successful computer programmer, because anyone can be a successful computer programmer, is crazy."

I find that all too often lack of aptitude is used as an excuse. He didn't put the time in, he doesn't know if he could be a successful computer programmer or not. The only way to know is to try. Everyone who starts something is awful in the beginning. Only through concentrated effort and interest does your potential emerge. Your potential cannot be seen in the first hour, or even ten hours you spend doing something.