I hadn't heard the saying you describe literally, though I've heard many variants of "find your passion" such as "find a job you enjoy doing and you will never have to work a day in your life." (Attributed to Mark Twain, Confucius, and others though the true origin seems to be obscure.) Which makes little sense to me since being paid to do something tends to destroy intrinsic motivation.

Perhaps there's a crystallized version of your saying such as "the fastest way to turn your passion into drudgery is to get paid for it."

Fortunately my passions are things I'm unlikely to get paid for - watching netflix, eating snacks, etc..