Arsenal boss Mikel Arteta feels they were back to their best for victory against Chelsea last night.
The result saw Arsenal usurp Chelsea as Premier League leaders.
Arteta said, "It is four games to go, we are at the top right now.
"We cannot do that (let heads drop), to be where we are after 10 months against the team we are fighting against, being there and having the possibility to be top - we have to enjoy it and embrace it, maximise the opportunity that we have because we don't know what is going to happen.
"We wanted to have a very different approach to the game, and we did it right from the beginning.
"The team is back to its best. We wanted to prove we had that fire in the belly. I could see that in the last few days, and we prepared (for) the game well.
"Mentally we arrived in the right mood and with the right level of energy. Everything went for us as well, which is important.
"We've had a couple of difficult weeks with very different games, with a lot of emotions involved. We're back to the top of the league - let's see what happens."