Barca now trail Real by six points at the top of the table after victory over Athletic Bilbao.
"Scoring goals is always a joy - that's why I celebrated with so much intensity," Iniesta told fcbarcelona.com. "It just came out that way. I always want to help and play well.
"We needed to win the three points - that's what's really important. If we keep on winning all three points each week we'll have a chance to win the title at the end of the season."
His sentiments were echoed by youngster Thiago Alcantara, who said: "We hope to cut into (Real's) lead. We believe we can make a comeback.
"Everything is possible and we can fight, however, we are not only dependent on ourselves."