Staying at Blues would have been easy call but I'm ambitious: Luiz
Arsenal 2 Burnley 1
David Luiz insists he chose the difficult option by leaving Chelsea to join rivals Arsenal during the summer.
The 32-year-old made his Gunners debut in Saturday's 2-1 Premier League win over Burnley.
New Chelsea boss Frank Lampard, who had played alongside Luiz at Stamford Bridge, allowed the Brazil international to leave as he was not part of his plans.
Luiz was warmly welcomed to the Emirates Stadium as goals from Alexandre Lacazette and Pierre-Emerick Aubameyang proved enough to see off Burnley, who had equalised through in-form Ashley Barnes.
Luiz is expected to become a big part of Unai Emery's plans for the campaign, playing alongside Sokratis Papastathopoulos as he did at the weekend, and the South American is raring to go for a new chapter in his career.
"I am a guy with ambition and that is why I moved," he said. "I could choose a comfortable zone and get money and be cool and that is it. But I like a new challenge and new things in my life.
"This is what gives me oxygen and gives me motivation and also to really enjoy this moment. One day football will finish and you have to try to do things and improve every day.
"I am trying to be first honest with my heart and honest in the way that to try to feel new things."
Luiz's last game for Chelsea was last season's 4-1 Europa League final win over his new employers as the former Paris St Germain defender lifted his sixth major honour in two spells at the club.
Now he wants to use his experience to help Arsenal get back amongst the elite - and feels it is all about the squad having belief in their capabilities to do so.
"In life you have to believe, if you don't try things you are never going to know if you can do it or not," he added
"My philosophy is to be positive and be a dreamer. But to dream is one thing, to achieve you have a lot to do."