If you're willing to listen, you can learn all sorts of lessons from all kinds of people.
Today, I had the chance to see Cal Ripken, Jr speak at a conference in Baltimore, Maryland. Just in case you don't know him, he played many seasons with the Baltimore Orioles baseball team. He holds the Major League Baseball record for the most consecutive games played (2632).
He spoke about his personal perspective on perseverance and success. At one point, speaking about the need to continually learn, grow, and improve, he said:
The ones who become satisfied with who they are have short careers.
What a powerful way to make the point about the need to constantly invest the effort to become better. He was speaking specifically about baseball players, and the lesson applies to all of us: leaders, team members, co-workers, parents, and spouses.
I encourage you to take this wisdom to heart and to commit yourself to lifelong, personal growth.