Don't kill the golden goose.

Medicine is a golden goose that has to be killed because every time the goose lays a golden egg, someone gets sick or dead.

Don't kill the goose with the golden egg

We have our hand on the neck of the golden goose and we're squeezing hard.

Kill not the goose that lays the golden eggs

The thing about Paris, it's a great city for wandering around and buying shoes and nursing a cafe au lait for hours on end and pretending you're Baudelaire. But it's not a city where you can work.