The Cardinals finished bottom of the NFC West last season, winning just five of their 16 regular season games.
The quarterback told the team's official website: "You know nobody's going to go undefeated in the division and every game is so important.
"I think we're a lot better than the rest of the league thinks, and I think St Louis is a lot better than the rest of the league thinks. Just because everybody is talking so much about Seattle and San Francisco, our two teams have a lot to prove of ourselves."
Running back Yeremiah Bell added: "There's talk about this team being the best or that team, but you still have to go out and prove it. In a division like we have, the games mean that much more, and they are that much more fun."
The Cardinals play the St Louis Rams this evening.