These are really valuable advices. What is left out, in my opinion, is how specialization (even in the things you do just for yourself) inherently leads to str

These are really valuable advices. What is left out, in my opinion, is how specialization (even in the things you do just for yourself) inherently leads to stress and lack of happiness. And being a generalist makes earning a living in our society nearly impossible (for most of us). Of course you have to love what you do to be good at it. But you can love many things at once.