For legendary NFL coach Bill Belichick, winning is pretty much second nature.
His team, the New England Patriots, has one of the best records in the sport and is looking to secure its sixth Super Bowl title this Sunday.
"He is an unsentimental evaluator of people and doesn't let anything get in the way of their performance," says CNBC contributor Suzy Welch on "Power Lunch." "And he's got the Super Bowl rings to prove that that works."
In 2017, she spoke with the NFL coach in a rare, wide-ranging interview that touched on a number of topics, including his leadership skills, his keys to winning and his thoughts on star quarterback, Tom Brady.
Here's his advice on achieving success.
Over the years, Belichick has relied increasingly on the "dependables" of his team, or the ones whom he trusts most to perform under pressure, as opposed to using the most flashy star athletes.
"There have been times when I've put too much responsibility on people. ... They might have been the most talented, or the people you hoped would do the right or best thing, and they didn't come through," Belichick says to CNBC. That's a huge mistake, he admits.
"You have to go with the person who you have the most confidence in, the most consistent," Belichick says. "And if it doesn't work, it doesn't work, but I'm going down with that person."
Belichick also revealed during the interview that it's important to care about your employees' personal lives and to help when possible. That way, they can perform their best at work.
"There are a lot of things that affect what happens on the field that occur off the field," he says. [The players] have wives and girlfriends. And they have babies. And they have personal situations. They have parents that are sick. All of it runs in together.
"The more you and the organization can help take care of personal situations," he adds, "the smoother the ship runs on the football end."
Belichick, who grew up idolizing his father's own successful career as a coach, says the most important aspect of selecting a job is to have passion for it.
"If there is something that's your passion when you're young, do it. Let everything else take care of itself," he says. "Don't pick a career for money or some other reason. Do what you love, because it will never feel like work."
Once you do select your career, you may find you're not the most naturally talented. If that's the case, recognize that early and put in the hours to succeed. That's what quarterback Tom Brady has done over the years, says Belichick, who he explains "is not a great natural athlete ... not even close."
"But nobody's worked harder than Tom," Belichick says. "He's trained hard. He's worked hard on his throwing mechanics, on his mental understanding of the game. He's earned everything he's achieved."
Success, he says, "is not all about talent. It's about dependability, consistency, being coachable and understanding what you need to do to improve."
Another key piece of advice from Belichick and something he teaches his players: Always live in the moment.
"It's one day at a time," he explains. "We don't talk about last year. We don't talk about next week. We don't talk about next year.
"We talk about today and we talk about the next game," Belichick says. "And that's all we can really control. The rest of it will take care of itself."
Belichick believes that the game is won or lost before you hit the field, which is why preparation is key. The NFL coach watches the film of his players and creates scenarios and strategies for each one of these scenarios.
"He has a methodology for winning," says Welch, and he has a "super-human fixation on preparation."
She adds, "He does not leave anything to chance."
This article was originally published February 2, 2018 and has been updated.
This is an updated version of a previously published story.
Disclosure: NBC Sports is televising Sunday's Super Bowl.