It's a Heinlein quote.

A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.

-Robert A. Heinlein

I'm on the fence, personally, some to like, some not.

If your work is niche, then you can get a higher pay rate and work less hours because you are in greater demand.

While it might work that way currently, I dont think its really desirable to have some people work way less than others based on skill. I dont think me being a software developer should result in me having more free time than the health care worker.