Yes, in our world, old thinking can be a stubborn thing. That's one of the reasons why we need term limits — old people think old ways. […] The old ways can be stubborn. But I believe the human heart is stronger. I believe hearts can change. I believe minds can open. That's how change happens. That's how societies move forward. It's not always a straight line — step by halting step — sometimes you go forward, you move back a little bit. But I believe we are marching, we are pointing towards ideals of justice and equality.

Remarks to the People of Africa (July 2015)