And to end, President Obama from his very fine speech in Tucson this week:
We recognize our own mortality, and are reminded that in the fleeting time we have on this earth, what matters is not wealth, or status, or power, or fame - but rather, how well we have loved, and what small part we have played in bettering the lives of others.
 These words were spoken by Dr. King at the First Annual Institute on Non-violence and Social Change, held in Montgomery, Alabama, in December 1956. The reading can be found in A Testament of Hope: The Essential Writings and Speeches of Martin Luther King, Jr., edited by James M. Washington, pp. 139-140.