The Gunners scored twice in the second half to register a 2-1 victory in their Premier League clash.
"There is nothing better than winning," he told Sky Sports News. "The first half was quite difficult, we were slow in our combinations and Swansea were sharper than us.
"It was a question of being patient without making mistakes. Afterwards, we were much stronger and playing at our level. We took advantage of the chances we have created.
"We have substance in the team and we could see that today in the second half. We came out with purpose in our game and that was important."
Arsenal are currently at the top of the league table with 15 points from six matches.