Arsene Wenger is frustrated by the goalless draw with Chelsea which ended the Gunners' hopes of taking sole possession of top spot.
Arsenal drew 0-0 with Chelsea on Monday night at the wet and windy game at the Emirates Stadium.
Wenger's men are now without a win in four games, but trail Liverpool in the standings only on goal difference.
"We're going through a patch where it's a bit more difficult, but part of a successful season is how you deal with that," the Frenchman said.
"The spirit of the players is unbelievably focused. There's a great desire.
"But let's be serious: if after the first game against Aston Villa (when Arsenal lost) I'd told you we'd be top of the league at Christmas, you'd have told me I was absolutely mad.
"We are where we are. The last three games have been a bit more difficult, but we have played Everton, Man City and Chelsea."
Mourinho was content with a point, but Wenger wanted more.
He added: "Overall, they were happy with a point and we weren't. But we couldn't take our few chances we created.
"We dropped two points tonight and that's what we want to focus, to win the next game (at West Ham) on Boxing Day."
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