David Luiz says ambition was the reason he decided to join Arsenal this summer and insists staying at Chelsea would have been the easier option for him.
The 32-year-old defender made his Gunners debut in Saturday's 2-1 Premier League win over Burnley having swapped west London for north London.
New Chelsea head coach Frank Lampard, who had played alongside Luiz at Stamford Bridge, allowed the Brazil international to leave as he was not part of his plans for the new season.
"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 a challenge and new things in my life.
"This is what gives me oxygen and gives me motivation and also to really enjoy this moment of my life. One day football will finish and you have to try to do things and improve every day as one day I will miss football.
"I am trying to be first honest with my heart and honest in the way that to try to feel new things. Everyone knows I was so happy at Chelsea and won many trophies there and had a real honest conversation with Lamps, and Lamps had different ideas for his plans for the year."