Who said "Authority must be earned, not assumed."?

This quote is attributed to F.W. de Klerk.

Authority must be earned, not assumed. - F.W. de Klerk

"Authority must be earned, not assumed."

F.W. de Klerk Leadership

President, Apartheid Reformer South African Born 1936 (age 90)

"Negotiation and dialogue are preferable to confrontation and violence."

"Change is inevitable, but the direction of change is not."

"Leadership requires the courage to make difficult decisions."

"Freedom is not given; it must be earned and defended."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"