Eduardo says Arsenal's players are enjoying silencing their critics.
The Croatia striker is delighted to see the Gunners amongst the title contenders.
"We are attractive and also efficient, we are scoring a lot of goals and the fans are happy," he said. "Everything is in place and our ambitions are growing stronger and stronger.
"We all believe so much that we will fight for top spot in the Premier League and also in Europe until the very end.
"Confidence is sky high which of course is not surprising, as our results are really very good. Now we are so proud, because at the start of the season everybody wrote us off.
"Nobody believed that we were good enough to play with the big boys. But we can and this is such a big motivation for us."