“Speech, Madison Park High School, Boston, 23 June 1990; Partly cited in Remembering Nelson Mandela's Visit To Roxbury at wgbhnews.org, December 5, 2013; and partly cited in "Nelson Mandela's 1990 visit left lasting impression" by Peter Schworm on bostonglobe.com, December 7, 2013”

Source: Wikiquote