"You are playing at home with 60,000 people behind you and it is a bit disappointing when you go 1-0 down, but you have to think positive," he said. "I missed a few chances and was not happy about that, but you have to keep going and that is one of the reasons why you play at the top."
Van Persie maintained: "At this time in football, the mental aspect is really important, maybe more than 30 or 40 per cent.
"If you look at the games we have played, like against Bolton and Blackburn, the mental aspect is more important than the way we want to play.
"I do not think it is a real big problem for us, but every single time we have to prove it again.
"Last season we played fantastic for three-quarters of the season and then suddenly everything fell down. I do not know if the reason is mentally, maybe it was a bit of everything, but we learned a lot from last year as well.
"The season is long, we lost some points, but we won some as well so we just have to stay positive.
"The whole squad realise that because we still have to play against the big teams and lots of big tests for us are on the way."
Having lost twice already, Gunners boss Wenger accepts the margins for further error are slim if his men are to claim a first title since the 'Invincibles' campaign of 2003/2004.
"We have to stay as close as we can to the top. Had we lost, we would have been seven points behind the leaders. That's too many points," he said. "It would not be all over, but you give yourself a big mountain to climb if you are seven points behind Chelsea.
"You don't want your team to lose confidence and after the shock against Hull, not to win against Everton would have been difficult for the confidence for the team."