If Thursday night’s debut was a “tired” Jaromir Jagr not playing up to his own standards, then the Bruins will hope that the 41-year-old remains thoroughly exhausted through the final 12 regular season games and playoffs.

Maybe they’ll even put him through extra practices or arrange for 4 a.m. wakeup calls at his hotel room on the road because Jagr was the difference between winning and losing in his Boston Bruins debut. The future Hall of Famer potted his 15th goal of the season in the second period and that proved to be the game’s only score in a 1-0 victory for the B’s over the Devils at TD Garden.

But he was basically apologizing to Brad Marchand and Tyler Seguin in his postgame comments because he felt that he wasn’t up to Jagr snuff after dealing with the tumult of moving from Dallas to Boston.

“I told [Marchand and Seguin] ‘I’ve got to get better.’ I felt bad for them they had to play with me, but I’ve got to get better. That’s for sure,” said Jagr, who also led the Bruins with five shots on net and brought the power play to life while logging a full two minutes on the man advantage. “I don’t know, maybe the stress of [being traded], and just surprised I got traded. Then I have to pack and get ready, and I didn’t sleep very well last night. I slept only two hours, so I don’t know what I meant. It just hits you. I have to go and sleep, and it’s going to get better.”

The Bruins will gladly take better as well, but a Thursday night game against the Devils turned into a giant Jagr welcoming party when he received a standing ovation after skating onto the ice for a face-off on his first shift of the game. There were chants of “Jagr! Jagr! Jagr!” for the mulleted one, and he quickly realized that he wasn’t in Big D playing hockey anymore.