moon: Mandela was a 'giant for justice' The UN Secretary General Ban Ki-moon has paid tribute to Nelson Mandela, saying that he was a "giant for justice and a down-to-earth human inspiration." Mr Ban said that Nelson Mandela showed "what is possible for our world." He added: "Let us continue each day to be inspired by Nelson Mandela's lifelong example - to keep working for a better and more just world."