Ronaldo hit the winner at the Nou Camp midway through the second-half.
"My goal was important because it gave us three points, but the victory is what really matters. I've scored in my last three games at this stadium, but what matters is the team and it gave an exhibition performance tonight. I wish to congratulate my teammates because they gave a very good performance. They deserve this," said Ronaldo.
"Four games remain. The seven point lead leaves us in a comfortable position, but we have to realise the other games are also important. We're in good form, happy and driven. We know the responsibility that comes with our next games. I am very happy."