Often hailed as the "Queen of All Media," as well as one of the most influential people in the world, Oprah Winfrey is undoubtedly an icon of entrepreneurship: From very humble beginnings in rural Mississippi, Winfrey went on to become first woman in history to own and produce her own talk show, The Oprah Winfrey Show and founded her own film and television production company, Harpo Productions Inc.

Adding to Winfrey's many credits is the movie Selma, the first feature-length film made about Martin Luther King Jr., which she helped to produce. She also plays a small role in the film as activist Annie Lee Cooper. The movie focuses on King's march through Alabama from Selma to Montgomery in 1965, in an effort to secure black voting rights.

Winfrey is best known for the wisdom she shares on life, leadership, and coping with adversity. With the film's release, here are some of Inc.'s favorite quotes from the actress, philanthropist, and producer to date: 

On gratitude:

"If you concentrate on what you have, you will always end up having more. If you focus on what you don't have, you will never, ever have enough." --2012 Lifeclass.

"Gratitude is the single greatest treasure I will take with me from this experience." --The Oprah Winfrey Show, final episode.

On failure:

"There is no such thing as failure. Failure is just life trying to move us in another direction." --2013 Harvard University commencement speech. 

On respect:

"I don't yell at people, I don't mistreat people. I don't talk down to people, so no one else in this building, in this vicinity, has the right to do it." --2008 Black Enterprise interview with editorial director Sonia Alleyne. 

On passion:

"Everybody has a calling. And your real job in life is to figure out as soon as possible what that is, who you were meant to be, and to begin to honor that in the best way possible for yourself." --2011 Lifeclass.

"Use your life to serve the world, and you will find that it also serves you." --2011 Lifeclass.

"You have to know what sparks the light in you so that you, in your own way, can illuminate the world." --2014 Stanford Business School interview, discussing The Oprah Winfrey Show's final episode

On accountability:

"You are responsible for your life. If you're sitting around waiting on somebody to save you, to fix you, to even help you, you are wasting your time. Only you have the power to move your life forward." --2011 Lifeclass. 

On validation:

"I've talked to nearly 30,000 people on this show, and all 30,000 had one thing in common: They all wanted validation...I would tell you that every single person you will ever meet shares that common desire." --The Oprah Winfrey Show, final episode.