Let us live by their example. We can acknowledge that oppression will always be with us, and still strive for justice. We can admit the intractability of deprivation, and still strive for dignity. We can understand  that there will be war, and still strive for peace. We can do that - for that is the story of human progress; that is the hope of all the world; and at this moment of challenge, that must be our work here on Earth.