This is honestly one of the most powerful pieces of writing that I've ever seen describing why health - along with social and economic justice - should be considered a human right. Paul Farmer is a giant in the field and his writing has definitely influenced my life course.
This is a long, at times painful read, but I think it is a really an important essay.
Never again? Reflections on Human Values and Human Rights. By Paul Farmer, The Tanner Lectures on Human Values