This poster contains the inspirational quote:
"I have walked that long road to freedom. I have tried not to falter; I have made missteps along the way. But I have discovered the secret that after climbing a great hill, one only finds that there are more hills to climb. I have taken a moment here to rest, to steal a view of the glorious vista that surrounds me, to look back on the distance I have come. But I can rest only for a moment, for with freedom come responsibilities, and I dare not linger, for my long walk is not yet ended." 
(Nelson Rolihlahla Mandela, born 1918, South African lawyer, statesman and 1993 Nobel Peace Prize winner, from Mandela's inspirational 1994 book, Long Walk to Freedom.)