Wojciech Szczesny admits that losing his first-team place last season taught him a lesson.
The Polish goalkeeper was dropped for the Champions League trip to Bayern Munich in March and was kept out of the side for five consecutive games - all of them victories - by compatriot Lukasz Fabianski.
An injury to Fabianski gave Szczesny another chance in April and he has gone from strength to strength since returning to the fold, starting all but one of Arsenal's matches this season.
"Looking back now it was a good lesson for me, one that I needed at the time," Szczesny told reporters ahead of the visit of Borussia Dortmund.
"I definitely have got sharper since then, I have worked harder in training. It worked back then for me and I have carried on doing it.
"I am feeling like I am a bit more consistent at the moment. I am trying to do the same thing all over again and it seems to be getting the best out of me."
Szczesny has been on an upward curve since he won his place back but he insists that is not his priority.
"We are winning and that is the most important thing," said Szczesny. "I am getting to the point in my career where all I care about is the team, and if the team wins I am happy.
"I would have preferred a few more clean sheets, but I am just delighted with the team's form, how we have been playing and getting the results."Copyright 2017 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source