The task of leadership is not to put greatness into people, but to elicit it, for the greatness is there already. – John Buchan

More about John Buchan, the man behind this quote on real leadership:
John Buchan was Governor General of Canada for six years (1935-1940) and was quite a literary figure writing quite a few spy thrillers. He used his writing skills during World War 1 as well, writing World War propaganda for the British Government. He has lots of interesting quotes attributed to him.