David Luiz wants his Arsenal teammates to fight for significant trophies this season.
The Gunners have began the Premier League with two straight wins.
"In life you have to believe," Luiz said to reporters about Arsenal's title hopes.
"If you don't try things you are never going to know if you can do it or not.
"My philosophy on life is to be positive and to be a dreamer. But understand to dream is one thing and to achieve your dream you have a lot to do.
"I can dream and we can fight for something big. That is always going to be my speech to everyone – it is possible for us and everybody.
"It is up to the team, the team is going to dream more, the team is going to prepare better, understand the game and that is it."