Warren Buffett, 88, and Leon Cooperman, 75, are two of the most successful investors of all time. Buffett, the chairman and largest shareholder of Berkshire Hathaway, is worth a cool $86.6 billion, while Cooperman, the founder and CEO of Omega Advisors, has a personal fortune of about $3.2 billion.
The self-made billionaires both readily admit that they wouldn't be where they are today without good fortune.
Cooperman, who was raised by working-class Polish immigrants and was the first in his family to go to college, said on CNBC's "Fast Money Halftime Report": "Whatever success I've achieved, I think I've achieved it because I've been very lucky." He added that common sense and a strong work ethic have also contributed to his fortune.
"The womb from which you emerge determines your fate to an enormous degree for most of the seven billion people in the world," Buffett told journalist Rebecca Jarvis in 2013. "Just in my own case: I was born in 1930, I had two sisters that have every bit the intelligence that I had, have every bit the drive, but they didn't have the same opportunities."
In short, "if I had been a female, my life would have been entirely different."
By recognizing and appreciating their good fortune, Buffett and Cooperman may even put them at an advantage: Studies show that grateful people are more likely to be happy and successful.
They're far from the only business titans to focus on living an appreciative life, either. Self-made billionaire Oprah Winfrey tracked the things she was grateful for in a "gratitude journal" for a decade. In 2014, Mark Zuckerberg challenged himself to write one thank-you note a day.
And "Shark Tank" star Robert Herjavec says that taking the time to be thankful for where you are in life is key to career success. One of the ways you know you're on the right career path, Herjavec writes, is that, "you feel good — about yourself, about your life, about all you have achieved and all the things you plan to achieve."
Like this story? Subscribe to CNBC Make It on YouTube!