"Good leaders make allowance for the fact that even they can be wrong, and they know when and how to say sorry".
Former President of Liberia, H.E. Ellen Johnson Sirleaf is now in South Africa to join in the celebration of the 100th centenary anniversary of President Nelson Mandela birth, in South Africa.
Mr Mandela, a giant of the struggle against apartheid who served as South Africa's president from 1994 to 1999, died in 2013 aged 95.
Obama has made an art of criticizing the current President's values without explicitly naming Trump, peppering his speech Tuesday with warnings against some of Trump's key policies, including protectionism, climate change denial and closed borders.
Mr. Obama was cheered with standing ovations from about 15,000 people at a Johannesburg cricket stadium on Tuesday as he made his highest-profile public appearance since leaving office past year.
In his speech, Obama bemoaned what he described as the return of the old order of things.
"That kind of politics is now on the move.at a pace which seemed unimaginable just a few years ago", said Obama.
"It is time for us to stop paying all of our attention to the world's capitals. and focus on the world's grassroots".
Obama began by arguing that "the worldwide order has fallen short of its promise" because of vast inequality.
"Everyday I read the newspaper and just think like 'Brothers, what's wrong with you guys?"
"A moment in time at which two very different visions of humanity's future compete, for the hearts and the minds of citizens around the world".
Obama made no direct reference to his successor but warned that "politics of fear and resentment" were spreading, driven by leaders who scorned facts and told lies with an "utter loss of shame".
His first-born granddaughter, Ndileka Mandela says she remembers a man with a great sense of humour and humility.
Before Nelson Mandela Foundation CEO Sello Hatang could finish introducing Obama the 15,000 people attending the event stood up cheering and clapping.
His comments are seen as thinly veiled criticism of the current U.S. administration's use of what has been described as "alternative facts". In Uganda, President Museveni claimed that a social media tax would help the country's debt and regulate gossip causing public backlash.
Besides the new 4-part miniseries, Singh also produced a "Mandela documentary collection" that will also be broadcast on the Mandela 100 channel on DStv, and include Beyond Long Walk To Freedom, Countdown To Freedom, Prisoners Of Hope, A Hero For All, Viva Madiba as well as the film produced specifically to commemorate what would have been Nelson Mandela's 100th birthday, Celebrating Mandela One Hundred.
Amid growing pressure both internally and throughout the world, the South African government finally released Mandela after 27 years in 1990.
When Obama was a US senator, he had his picture taken with Mandela.
Imprisoned for almost three decades for his fight against state-sanctioned racial segregation, he was freed in 1990 and quickly set about working to unite the nation through forgiveness and reconciliation, becoming South Africa's first black president.