"Big-time players make big-time plays in big-time games, and that's all I kept telling myself over and over and over, `Vernon, you got to step up, the team needs you,"' Davis said.
The play, which Davis branded "The Grab," almost never happened.
Davis revealed earlier this week that he "almost wanted to quit" at times while adjusting to Harbaugh's complicated playbook, which has a heavy demand on tight ends. He also kept quiet throughout the season while his receptions dwindled, taking more of a blocking role than the one that turned him into one of the NFL's best catching tight ends.
"I said, `He's a great football player,"' Harbaugh said he whispered to Davis during the celebration. "There's a special place in your heart for players that play well in big games."
Unhappy with his team only ahead 17-14 at the half despite the defense forcing four turnovers, Davis delivered a speech in the locker room that his teammates won't soon forget.
"He got a little emotional on us on offense and got after us a little bit," Smith said. "Great to see him come out in the second half and really just stay patient."
Davis finished with seven catches for 180 yards and two touchdowns.
"One shot. That was the message," Davis said. "You only get one shot. If you don't take advantage of it, you go home. There was a lot of fire within me at that moment, and something just hit and I had to let it out. When you're a leader on this team, that's what you're supposed to do. You're supposed to step up, lead the team in times like that."
Davis put his stamp all over San Francisco's victory.
With time ticking down in the final 2 minutes, he took a 47-yard pass over the middle from Smith, racing down the Saints sideline to the New Orleans' 20. Three plays later, he caught the winning score in the opposite end zone of "The Catch" by Dwight Clark in the 1982 NFC championship game.
Fittingly, the play was called "Vernon Post."
"History. History was going through my mind. It was us against us," Davis said. "That's all I could say to myself. It was us against no, us against can't. All those things. And we managed to pull it off."