Who said "Perseverance is the currency of achievement."?

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

Perseverance is the currency of achievement. - F.W. de Klerk

"Perseverance is the currency of achievement."

F.W. de Klerk Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."