The Serie A title holders had a European mountain to climb heading into the second leg of a last-16 showdown with La Ligaopponents.
Trailing 2-0 from a disappointing showing on Spanish soil, the Italians were looking for a flash of brilliance from somewhere and found it in the form of their Portuguese superstar.
Ronaldo told Sky Sport Italia: “It had to be a really special night and it was.
“If we continue like this, we have not won yet but we have reasons to be proud and we are on the right way.
“That's why Juve signed me and I tried to do my best job.
“It's a magical night. It was a very difficult team to play but we showed that we were a very big team. We proceed step by step, we will see.”
Juventus are now into the last eight and can look forward to the quarter-final draw on Friday