AdvertisementOpinionKing's Son And Friend Talk New Memorial, MediaAugust 24, 2011NPR StafffacebookEmailOne of Martin Luther King Jr.'s famous quotes is inscribed along a wall at the slain civil rights leader's new national memorial. The quote says, "The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." (NPR)