"I would say to the young people, the young protesters, and those not so young: Accept a way of peace, believe in the way of love, believe in the philosophy and the discipline of nonviolence," Lewis told The Associated Press.
"Never become bitter. Never become angry. And do whatever you can to speak truth to power, and be hopeful, be optimistic.
"The struggle is not a struggle that lasts one day or a few weeks or a few years. It is a struggle of a lifetime."