In “Anything You Want” book by Derek Sivers (“40 lessons for a new kind of entrepreneur”), you find lessons from 10 years of experience in one hour, designed to be immediately usable for your own business or project.
I liked the book a lot, very nice. I had just one issue with it – you said something like that the main focus of an entrepreneur is to remember he/she is happy, so if at some point they don’t like the business anymore, the could sell it, like Derek did, instead of struggling with it a lot.
I think there’s a difference between what makes me happy on the short term (eating ice cream) and on the long-term (not getting sick by eating too much ice cream for longer periods of time). So, yes, you can definitely go out of a business if that makes you happy in the short term. But if you think you can move the world in the long run, you could give that business a chance.
Other than that, a nice book! Recommended.