On Wednesday, I had the honor of celebrating his remarkable life by sharing a few lessons I’ve taken from him with the people of South Africa.

I’d like to share what I believe to be the most important of those lessons today.

And I’d like to ask you to make a commitment, right here, right now, to honor the life of one of history’s great giants. Tell me what you’re doing, no matter how large or small, to make the world a better place.

I believe that the most important thing that we can take away from Madiba’s life today is that the persistent struggle for hope, for justice and equality—for the long walk to freedom—requires a belief in youth.

As strong as Madiba’s spirit may have been, he would not have sustained his hope had he been alone in his struggle. Part of what buoyed him up was that he knew that, each year, the ranks of young leaders were replenishing. He knew that young men and women—black and Indian and white, from across the countryside, across the continent, around the world—would, in those most difficult days, keep working on behalf of his vision.

Today, more than ever, I believe in Nelson Mandela’s vision: that every generation has the opportunity to remake the world.

Here, in South Africa, my Foundation convened 200 young people from across this continent who are doing the hard work of making change in their communities; men and women who reflect Madiba’s values; the youth who are poised to lead the way.

People like Abaas Mpindi, a journalist from Uganda, who founded the Media Challenge Initiative to help other young people get the training they need to tell the stories that the world needs to know.

People like Caren Wakoli, an entrepreneur from Kenya, who founded the Emerging Leaders Foundation to get young people involved in the work of fighting poverty and promoting human dignity.

People like Enock Nkulanga, who directs the African Children’s Mission, which helps children in Uganda and Kenya get the education they need.

On Thursday, I had the opportunity to join these young leaders in an act of service at the Far North Secondary School in Johannesburg to commemorate the anniversary of Mandela’s birth. Though the work we did was simple—cleaning windows, building benches, painting murals—it left me with a profound sense of hope.

By working together to build a better life for the children of the school, this new generation of leaders was honoring Mandela’s life and legacy. And they reminded me of one of my favorite quotes of his: “There can be no greater gift than that of giving one’s time and energy to helping others without expecting anything in return.”

None of us can rest on the accomplishments of the past, even those as momentous as Mandela’s. But if we live our values and empower our young people, then they can pick up the work of the last 100 years, and lead us into the future.

Honor Madiba’s life, and the way he changed the world by making a commitment to make a difference today. Even if it’s small. Especially if it’s small.

Thank you.

– Barack