"My former boss Barack Obama likes to invoke a teaching of Martin Luther King Jr.: "The arc of the moral universe is long, but it bends toward justice." It sounds nice but it's not quite true. The arc can bend toward justice, but much of the time it tacks stubbornly toward the status quo. We must be willing to do the work, reaching up with our own hands and wrenching the arc away from stasis and toward a better future. And when the arc seems to be bending away from justice, we have to dig deep, muster even greater resources, and bend it back."