What are important ethical quotes in the passage?

“When someone works for less pay than she can live on — when, for example, she goes hungry so that you can eat more cheaply and conveniently — then she has made a great sacrifice for you, she has made you a gift of some part of her abilities, her health, and her life. The 'working poor,' as they are approvingly termed, are in fact the major philanthropists of our society...."