The Frenchman, whose side play Marseille on Tuesday, is glad that to see that his men have put their rotten start to bed.
"If you have gone through what we have gone through since the start of the season, it's reassuring for me," Wenger said.
"The players have suffered, but that shows the belief and spirit is back.
"The spirit is great and all this together explains why the players reacted like that (after the final whistle).
"The spirit is strong and you feel that in the dressing room.
"The players are determined together and they want to play like we did against Chelsea. That encourages us to believe that we have the quality."