Peak newsletter 🧠 | This is an excerpt from The Athletic’s weekly newsletter covering the mental side of sports. Sign up here to receive the Peak newsletter directly in your inbox.Sometimes the most valuable advice comes from people who have lived through the process: trying, failing, learning and trying again.With that in mind, I asked 13 successful athletes to share the single best piece of mental advice they’ve ever received.I hope you might find some insight that stays with you somewhere in their answers.Steph Curry: Next playCurry is a four-time NBA champion and two-time NBA MVP who has spent his entire career with the Golden State Warriors.Curry: Coach Bob McKillop at Davidson always preached “next play” mentality. I needed it in college because I used to turn the ball over all the time.And he was like, “Don’t let that linger to the next play.”You know, intentional amnesia.Next play mentality is a life principle, too. You’re not always going to get it right, you’re not always going to get it perfect, but you do have another opportunity, God willing, to make the necessary changes. So next play mentality, keep your confidence.I think it keeps a level of control amongst the uncontrollable. That’s what life is. There are so many things and factors and variables that you don’t control, but you do control how you respond to them. That was his way of bringing that idea to life.Austin Reaves: Be true to yourselfReaves is a guard for the Los Angeles Lakers. After going undrafted out of Oklahoma, he signed a new contract this offseason.Reaves: LeBron James told me that my rookie year. I don’t smoke, I don’t drink, I don’t like going out. I stay in the house, and that was the first thing he told me.He was like, “Don’t try to fit in with anybody that you’re not. If you want to do something, do it. If not, do what you like to do.”I felt like a weight off my shoulders because I could just be myself every day instead of trying to act like somebody else.It’s not even necessarily anything to do with basketball or sports. I think it’s just life in general. Be yourself and be a good person, and at the end of the day, good things will happen.”Charles Barkley: Don’t worry about other peopleBarkley is an NBA Hall of Famer and 11 time All-Star.Barkley: You handle your business, and you’ll be successful.