Steve Jobs said it best (I will paraphrase a bit), “People say you have to have a lot of passion for what you are doing, and it’s totally true. The reason is because it is 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, you’re not having fun doing it, you are going to give up. That’s what happens to most people. The ones who became successful did the things they loved so they could persevere when the going gets tough.”