Glendale, Ariz. ? One by one, the players walked through the Arizona Cardinals’ spacious locker room showing off their “Prove It” T-shirts. They might as well have been Philadelphia Eagles, too.

Is there any phrase more pertinent for today’s NFC championship game than the one adopted by the Cardinals? For both sides?

Consider, first, the NFC West champions.

The Cardinals haven’t won a league title since 1947. They hadn’t taken a division crown in 33 years before this season, when they managed it primarily by going 6-0 against weaklings San Francisco, Seattle and St. Louis. In matchups with some of the NFL’s bully boys — the Giants, Panthers and Patriots — they lost by a combined 111-59.

Throw in a 48-20 Thanksgiving night roasting at Philadelphia and, well, “Prove It” indeed.

“It is a motivation thing,” linebacker Karlos Dansby acknowledged. “We have to prove to the world that we can play at this level and play at a high level and try to win on this stage.”

A stage few people outside of the Valley of the Sun — and probably most folks in Arizona — never imagined the Cardinals would reach this year. Even when, following an early clinching of the division, they turned around a December swoon by beating Seattle, a common description of the Cardinals was “the worst division winner in NFL history.”

“It definitely put fuel to the fire,” Dansby said. “We were motivated, and we had a lot of poise on the defense and on the offense.”

Predicted to lose to Atlanta in the wild-card round, the Cardinals won, 30-24, outgaining the Falcons by 107 yards, getting three sacks and forcing three turnovers.

Most observers shrugged.

But when they went to Carolina, where the Cardinals fell, 27-23, during the season, and romped, 33-13, getting six takeaways, well, they certainly had proved something.

“I think we have corrected some things, made less mistakes,” said Kurt Warner, one of the few Cardinals with any knowledge of championship-game surroundings. Warner, the 1999 and 2001 NFL Most Valuable Player with two trips to the Super Bowl and one win, has been a settling force for Arizona (11-7).

“Guys have gone and focused on the details a little more. We have taken advantage of plays that are there to be made.”

The Eagles were in a much more dire situation in December. While the Cardinals were trying to get straightened out before the postseason, Philly was trying to figure out how to get into the playoffs. It needed more help than was rightful to ask for.

Yet the Eagles got that help. Sure, they had to recover from Donovan McNabb’s benching in a lopsided loss at Baltimore. And from a tie at lowly Cincinnati. And from a misstep at Washington in the penultimate week of the schedule.