Nearly 60 percent off fathers in the U.S. say that being a dad is an extremely important part of their identity, Pew Research Center finds. As people across America celebrate Father's Day this Sunday, here's a look at the best advice Warren Buffett, Bill Gates, Mark Cuban and other highly successful people have received from their fathers.

Peter Buffett, Warren Buffett, and Susie Buffett attend 'Becoming Warren Buffett' World Premiere at The Museum of Modern Art on January 19, 2017 in New York City. ( Jamie McCarthy | Getty Images

Warren Buffett: Maintain a good reputation

Legendary investor Warren Buffett credits his success largely to his late father, Howard H. Buffett. "The best gift I was ever given was to have the father I had when I was born," Buffett says. He adds that his father was his No. 1 teacher in life. "The best advice I've ever been given is by my father, who told me it took 20 years to build a reputation and 20 minutes to lose it," Buffett says. "And if you remember that, you'll do things differently."



Phoebe Adele Gates, Bill Gates, and Melinda Gates attend the Goalkeepers 2017.

Bill Gates: Do things you aren't good at

Microsoft co-founder Bill Gates says his father, William Gates Sr., 92, is the man he aspires to be. "I especially admire his sense of integrity. He is one of the wisest and most calm people I know. And he taught me a lot about how to think," he writes on Gates Notes. When Gates was a kid, his parents encouraged him to do things he wasn't good at. "At the time I thought it was kind of pointless, but it ended up really exposing me to leadership opportunities and showing me that I wasn't good at a lot of things, instead of sticking to things that I was comfortable with," Gates tells Fortune.

Savannah O'Leary, Linda O'Leary and Kevin O'Leary attend the the kick off of Art New York and CONTEXT for 2016 New York Art Week at Pier 94 on May 3, 2016 in New York City.

Kevin O'Leary: Big goals require hard work

ABC "Shark Tank" investor Kevin O'Leary might not have become a millionaire if his dad hadn't offered him a key piece of business advice. "I wanted to become a photographer when I was young," he tells CNBC Make It. "My dad told me, 'It's a very competitive space' and that 'maybe you should go learn how to run a business first.'" His father posed the question: What are you willing to do in order to be what you want to be? "I simply wasn't willing to take the risk of all the tasks and jobs required to support my dream of becoming a full-time photographer," O'Leary tells Business Insider.



Bauer-Griffin | Getty Images

Mark Cuban: Enjoy your youth

Billionaire co-host of the ABC show "Shark Tank" Mark Cuban says that his father, Norton Cuban, taught him one of his greatest life lessons. "My dad says it over and over, 'Today's the youngest you're ever going to be. You've got to live like it. You've got to live young every day.' And that's what I try to do," Cuban says.

Sara Blakely Earl Kibby | CNBC

Sara Blakely: You need to fail sometimes

When Spanx's founder and billionaire Sara Blakely was growing up, her father often asked her the same question at dinnertime: "What have you failed at this week?" "My dad, growing up, encouraged me and my brother to fail," Blakely told CNBC's "Squawk Box." "The gift he was giving me is that failure is [when you are] not trying versus the outcome. It has really allowed me to be much freer in trying things and spreading my wings in life."

Bill Belichick of the New England Patriots looks on against the Indianapolis Colts of the 2015 AFC Championship Game at Gillette Stadium last Sunday. Getty Images

Bill Belichick: Follow your passion

New England Patriots head coach Bill Belichick reminds his children of the advice he got when he was a kid. "I've told them the same thing my dad told me, which is, Follow your heart," Belichick tells CNBC contributor Suzy Welch. "If there's something that you love and that's your passion when you're young, do it. Let everything else take care of itself," he adds.

CEO of Amazon.com Jeff Bezos and family attend the premiere of Paramount Pictures' 'Star Trek Beyond' at Embarcadero Marina Park South on July 20, 2016 in San Diego, California. Todd Williamson | Getty Images

Jeff Bezos: Be resourceful