"Work to live" is what my parents told me years ago and what I tell my son. And while yes, avoid work you hate, look for something you like and can do. Making your job into your life isn't just unhealthy and a fast way to burn out; it makes you hate what you love. Speaking practically, job as life also rarely results in very good work.

As someone who worked in social services as a caseworker and now does tech work on the programs social service uses, the most important thing I learned is the difference between when long hours were what the work genuinely needed to get done and when it was my feelings making that call. My feelings are unaware that passionate sleep deprivation is terrible for extremely detailed analysis of design documents to create dozens of extremely detailed test scenarios to make sure a program serving the public actually works. My feelings are oblivious to how I need a clear, fresh, undistracted mind so I don't miss a scenario that could have caught the flaw that leads people unable to get food or go to the doctor.

A person's life's work is to be a person, whole and entire; your job is only one part of that. Trying to make it everything just means you'll end up being bad at both working and living.