On June 3, 2016, legendary American boxer Muhammad Ali passed away at the age of 74. Ten years after the world said goodbye to him, his voice still echoes – not in the roar of a crowd or the rhythms of a boxing ring, but in a hallway just outside my office at the United Nations.

There, on the wall, hangs a watercolour painting he made himself of the UN headquarters – a gentle, almost tender rendering of the building that has come to symbolise the world’s longing for peace.

Ali painted it in 1978 and presented it personally to UN officials, calling it “a gift of peace”.  It is more than an artwork – it is a bridge between his public courage and his private conviction that peace is humanity’s highest calling.

The brushstrokes are simple. The sincerity behind them is unmistakable. It is a testament from a man who understood, better........

© Al Jazeera