Stay in your lane, ignore other players' scores
The general rule of thumb the speaker teaches is to play your golf against the golf course; other players have nothing to do with you unless you let them. He warns against reacting to a playing partner's results, for example starting to slam eight-foot putts because they are holing long ones. The putt in front of you is the putt in front of you, so stay in your lane with the things you can do something about.
Channel: Mark Immelman
Watch official source at 21:22Why this context matters
He notes there are nuances when you are in contention coming down the stretch.