This is terrible advice in the general. I've known lots of people following this advice, to peruse a career in a field that doesn't really pay much. Ended up struggling and stressed.
Trust me, that's more stressful than a job fairly your fairy 'meh' about. It's much more likely to burn you out.
Most passions, when you turn it into job, just ruins the passion(Having done this myself). You go from something that's creative into something where cost, and timelines matter and you have very little personal input.
But, to play devils advocate... Having worked in a high paying, crap job and moving into a job with lower pay but much more aligned with my passion I am MUCH happier