“Come ready to play, or don’t come at all.”

That was Jaylen Brown’s top takeaway from arguably the Celtics’ most disappointing defeat of the season to date.

Brown believed Boston did not play with enough effort or enthusiasm Friday night against a Nets team that came in with a 2-12 record. The result: a 113-105 home loss at TD Garden, during which the Celtics trailed by as many as 18 points.

“We’ve got to come ready to play,” Brown said postgame. “We just went through the motions today. Like, I don’t understand.”

In Brown’s eyes, the Celtics were missing their necessary “edge” for “the majority of the game.”

It was evident in the opening minutes, when they fell behind by seven points while missing 15 of their first 20 shots. It was clear shortly before halftime, when Anfernee Simons,

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