Steve Jobs argues that passion for your work is essential because the job is so hard that without love for it, you'll rationally quit. Successful people persevere because they actually enjoy what they do.
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You have to have a lot of passion for what you're doing. And it's totally true. And the reason is because it's so hard that if you don't, any rational person would give up. It's really hard. And you have to do it over a sustained period of time. So if you don't love it, if you're not having fun doing it, you don't really love it, you're going to give up. And that's what happens to most people, actually. If you really look at the ones that ended up being successful in the eyes of society and the ones that didn't. Oftentimes it's the ones that are successful loved what they did so they could persevere when it got really tough. And the ones that didn't love it quit because they're sane. Right? Who would want to put up with this stuff if you don't love it? So it's a lot of hard work and it's a lot of worrying constantly. And if you don't love it, you're going to fail. So you got to love it, you got to have passion.