The late Wangari Maathai was a biologist, environmentalist, and the first African woman to win a Nobel Peace Prize. She was born under British colonial occupation and schooled by Catholic missionaries. But when she looked back on her childhood near the end of her life, she realized her family’s Kikuyu culture had imparted her with an intuitive sense of environmental balance. Maathai was steadfast in her determination to fight for the twin issues of conservation and human rights — and planting trees was a symbol of defiance.

Philosopher Kwame Anthony Appiah offers hope for quiet, sustained culture shift through the “endless shared conversation” of friendship. The writer of the New York Times “Ethicist” column studies how deep social change happens across time and cultures. “If you have that background of relationship between individuals and communities that is conversational, then when you have to talk about the things that do divide you, you have a better platform.”

“There is a place inside me that is far more powerful than the continuous mental noise,” says Eckhart Tolle. The spiritual teacher began to gain attention with his 1997 book, The Power of Now. Millions of people around the world have found pragmatic tools in his vision that fundamentally complicates the notion, “I think, therefore I am.”

A prolific writer on sociology, history, economics, and politics, W.E.B. Du Bois was one of the most extraordinary minds of American and global history. His life traced an incredible arc; he was born three years after the end of the Civil War and died on the eve of the March on Washington. In 1903, he penned the famous line that “the problem of the 20th century is the problem of the color line.” Du Bois was a formative voice for many of the people who gave us the civil rights movement and for all of us navigating the still-unfolding, unfinished business of racial justice now. We bring his life and ideas into relief through three conversations with people who were inspired by him.

“Imagine yourself alone on this planet. Would anything be the same?” Jennifer Michael Hecht is a poet, philosopher, and historian who wants to change the way we talk to ourselves and each other about suicide and staying alive — starting with her insistence that we believe each other into being. “Sometimes when you can’t see what’s important about you, other people can.”

Producer’s Note: Given the focus of Jennifer Michael Hecht’s work, this episode briefly touches on the topic of suicide.

Over the years, listeners have asked for short-form distillations of On Being — something to listen to while making a cup of tea. Our podcast Becoming Wise is this offering, designed to help you reset your day and replenish your sense of yourself and the world, ten minutes at a time. A taste of the new season, curated from hundreds of big conversations Krista has had with wise and graceful lives — including Archbishop Desmond Tutu, astronomer Natalie Batalha, and spiritual teacher Eckhart Tolle.

Rabbi Lawrence Kushner is a long-time student and articulator of the mysteries and messages of Kabbalah, the Jewish mystical tradition. Kushner says mysticism tends to appear when religion — whatever the tradition — becomes too formal and logical. “The minute mysticism becomes permissible, acceptable, possible, it’s an immediate threat to organized religious structures,” he says. “Because what mysticism does is it gives everybody direct unmediated personal access to God.” He is influenced by the Jewish historian Gershom Scholem, who resurrected Kabbalah from obscurity in the 20th century and made it accessible to modern people.