John Diaz explains in the San Francisco Chronicle how human lives are not considered equal in our society: "'All life is precious' goes the oft-repeated saying. But let's be honest with ourselves: In this society the value of a human life in the eyes of others is multiplied or discounted in many ways. One of them, obviously, is class. Another, undeniably, is race. And then there is the other, harder to measure variable that sometimes incorporates, but often transcends, race and class: Our ability to empathize with another human being, and measure his or her worth in ways that have nothing to do with earning potential, number of Facebook friends or volunteer hours at the local food bank."