Helen Keller was an American author, political activist, and lecturer who was born deaf and blind. She wrote \"The Story of My Life\" in 1903.

Malcolm X was an African-American Muslim minister and human rights activist. He wrote \"The Autobiography of Malcolm X\" with the assistance of Alex Haley in 1965.

Nelson Mandela was a South African anti-apartheid revolutionary and politician who served as the first president of South Africa from 1994 to 1999. He wrote \"Long Walk to Freedom\" in 1994.

Mahatma Gandhi was an Indian lawyer, anti-colonial nationalist, and political ethicist who employed nonviolent civil disobedience to lead India to independence from British rule. He wrote \"The Life of Mahatma Gandhi\" in 1927.

Billy Graham was an American evangelist and Christian minister. He wrote \"Just as I Am\" in 1997.

David Wilkerson was an American Pentecostal evangelist and pastor. He wrote \"The Cross and the Switchblade\" in 1963.

Maya Angelou was an American poet, memoirist, actress, and civil rights activist. She wrote \"I Know Why the Caged Bird Sings\" in 1969.

Corrie ten Boom was a Dutch Christian who helped Jews escape from the Nazis during World War II. She wrote \"The Hiding Place\" in 1971.

Rick Warren is an American evangelical Christian pastor and author. He wrote \"The Purpose Driven Life\" in 2002.

Norman Vincent Peale was an American minister and author. He wrote \"The Power of Positive Thinking\" in 1952.

Thomas Merton was an American Trappist monk, poet, writer, and social activist. He wrote \"The Seven Storey Mountain\" in 1948.

Saint Augustine was a Roman bishop and theologian. He wrote \"The Confessions of Saint Augustine\" in the 4th century.

Saint Teresa of Avila was a Spanish Carmelite nun, mystic, and writer. She wrote \"The Life of Saint Teresa of Avila\" in the 16th century.

The author of \"The Way of a Pilgrim\" is unknown. It is believed to have been written by a Russian peasant in the 19th century.

The author of \"The Cloud of Unknowing\" is unknown. It is believed to have been written by an English mystic in the 14th century.