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Another one of the important concepts in I Am is one that Oprah has said for years: If you don't do what your heart wants you to do and follow your passion, it will destroy you.

"People find happiness in direct proportion to doing what they love," she says. "If you don't do what you love, you die a little every day."

For this reason, Tom says he will not stop making comedies—he will always follow his heart. "I love comedy," he says. "I would happily serve that again. But I also have to do what's in my heart, which is ... I feel like I need to carry on this conversation."

Following one's heart may require him or her to make changes in life, and the way people change, Tom says, is to ask questions. The main question he wants people to ask themselves is this: Who are you? Not what your culture has told you to be, but who are you on the inside?

"I think many of us are living inauthentic lives," he says. "Authenticity means to be the author of your own life. I think many of us are telling stories that have been given to us rather than our own story."

More

• Find out if Tom is happier now and what he did with all his money
• Meet three young men who have followed their hearts and taken action in a big way
• Discover how you can start by making an impact this Sunday!