Over two decades after his "walk to freedom", Nelson Mandela has walked his final mile. The impact of his death will reach far beyond the frontiers of South Africa. There will be tears, but celebration for one of the most remarkable lives of our time. Madiba, as he was fondly known, leaves us with a memory of the best in public life to which any human can aspire. His signal contribution to humankind, the embrace and sustaining of forgiveness for his own, and for his people's oppression.