Jimmy Butler knows where his Miami Heat went wrong in Game 3 of the Eastern Conference Finals.

The Heat lost to the Boston Celtics 117-106 in Game 3 on Saturday night in Lake Buena Vista, Fla. The Celtics came out desperate for a win and meant business. They never trailed during the game and led by as many as 20.

According to Butler, the problem was very simple: “We didn’t play hard enough, or do anything we set out to do,” he said after the game.