Jayson Tatum spoke about winning his first championship, the quest to repeat and a few other topics during a recent public appearance to promote his new children’s book, writes Gary Washburn of The Boston Globe. The Celtics are preparing to open training camp in a few days, but the memories of the title run are still fresh in Tatum’s mind.

“We’ve gotten close a bunch of times,” he said. “We lost in the Finals. There’s a lot of people that doubted us, and I remember thinking about, ‘Man, when we win the championship, I can’t wait to tell everybody that doubted us, that had something to say.’ But you realize that moment that we won, when the confetti was falling and then the parade, it’s not about the people that doubted you. It’s about you guys, the guys that supported us along the way. Everybody that believed in us, and I can honestly say, the parade was the best two hours of my life.”

Tatum told the crowd, which was mostly made up of children and their parents, that his confidence level grew after the Nuggets were eliminated in the second round of the playoffs. He had been expecting to face Denver in the NBA Finals and felt good about the Celtics’ chances against anyone else.

When Boston took a 3-0 lead over Dallas, Tatum admitted being so excited about having the chance to win a title that he couldn’t sleep. He said the team was “so anxious and so tight” prior to Game 4, which the Celtics lost in a blowout, but everyone was more relaxed when they returned home to wrap up the series in Game 5.

Tatum also discussed the challenges the Celtics will face as they enter the season as defending champs.

“(Coach) Joe Mazzulla, he had a great quote the other day,” Tatum said. “He said, we’re not defending anything. We’re chasing another championship. We enjoyed it all summer. … I can’t wait for opening night to get our rings and see the banner being raised. But honestly, after opening night, we have to put it behind us. It’s a new season.”