Doc Rivers  has preached it over and over.
The shots aren’t always going to fall but the defense will always be there.
Such was the case on Saturday night when they shot just 42 percent in Indianapolis.
But they held the Pacers to 35 percent in an 86-72 win. Sunday night, they followed that up by holding the Sixers to 38 percent in a 103-79 romp that put them on the brink of their fifth straight Atlantic Division title.
How appropriate since defense has been the backbone of everything in the Doc Rivers “Big 3” plus Rajon Rondo  era.
Sunday, the Celtics  held the Sixers to 6-of-22 shooting the second quarter to take command of the game.
‘The defense is really good; guys are locked in,” Rivers said after Sunday’s game that improved the Celtics to 32-24 on the season. “Your offense will fail you, you know that guys; I don’t care how well you play, your offense is going to fail you sometimes. But if you come with the right mindset your defense never should. And it’ll always give you a chance to win a game.’
Even two weeks ago it would’ve seemed far fetched that Avery Bradley  would succeed Ray Allen  as the starting off guard next to Rajon Rondo in the backcourt. But combine his newfound ability to cut the basket with his shutdown defense and he’s become too valuable not to start. He has seen success defensively from both sides now.
‘Its very important for the bench to come in and bring the intensity,” Bradley said. “That’s something that Doc always, we take pride in as a team so we want to come in and bring the intensity and play hard on the defensive end and that’s what we did in the second quarter.
‘It was very important for us to win this game. We want to come out and play hard and ya know coming in the second half we wanted to come out in the third quarter and we wanted to bring our intensity up even higher. That’s what Doc told us, he told us to come in the third quarter and play hard and we were making shots and we just continued to make the lead even higher.’
Part of defense is rebounding and with Paul Pierce  staying home and crashing the boards, like his six first-quarter rebounds Wednesday against the Spurs, the Celtics are not giving up as many second and third-chance points. Even Sasha Pavlovic  has bought in. He had four rebounds in the first half Sunday, including three in seven minutes in the second quarter.
‘Well it’s a combination of things,” Pierce said. “We got to take care of the ball definitely, but we got to rebound the ball and I thought we did a better job competing on the rebounds, especially at the guard level myself, Avery, Sasha, Rondo getting in there rebounding the ball. So its going to be important for us as we wind down the season and in playoffs, that’s what our one true weakness is and if we can address that down the stretch we will be a tough team to beat.’