Kelly Olynyk scored a career-high 30 points off the bench in a 105-87 Celtics win over the 76ers Monday.

He shot with confidence. He competed for rebounds. He flicked long 3-pointers. He attacked the rim on pick-and-rolls.

Olynyk scored 14 first-quarter points as the Celtics responded from an early 11-2 deficit, and Boston took a double-digit lead in the second period and cruised from there. Olynyk made 12 of 17 shots, including 3 of 5 on 3-pointers, and had 9 rebounds and 3 steals.

I couldn’t really tell you, it just kind of happens,” Olynyk said when asked about his sudden aggression. “I talked to Coach [Brad Stevens] a couple of days ago and he said, ‘We need you to be aggressive. You need to stay aggressive. That’s when you’re at your best and that’s when you’re helping us.’ And that’s something that I’ve really been focusing on.”

“You need him to be aggressive every night,” Stevens said. “We need him to make shots. Our team depends on it. He’s a skill guy who can stretch the floor and we need him to do that.”

C’s head coach Brad Stevens believes Olynyk can be a regular, big-time scorer.

“What I want him to do is believe in himself the way we believe in him,” he said. “I think he’s really good and think he could be a really good player. You want to (go from) being a player who’s very capable of doing it and does it on multiple nights to a player that does it every single night.”

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Boston hosts Orlando on Wednesday.