The former Manchester United and Real Madrid star, who has scored a staggering 697 goals in 984 games during his career to date, told Juventus TV: "I have no secrets, just my dedication and my passion for this sport, I love to play football more than anything else".
The return leg in Turin saw Juve dominate the first half, with Ronaldo scoring a header in the 27th minute to make things interesting.
Ronaldo, 34, has now scored eight hat-tricks in the Champions League, equalling Messi's record.
Ronaldo nearly scored when his long-range free kick forced Atletico goalkeeper Jan Oblak to make a hard save in the ninth minute.
Ronaldo had not played in Madrid since joining Juventus in a blockbuster transfer at the end of last season. Joao Cancelo put in a cross from the right and although Oblak clawed Ronaldo's header out from under his crossbar, goal-line technology confirmed the ball had crossed the line. Remember that we had players out, yet this was a great game with what we tried in an incredible atmosphere - the stadium was really our 12th man tonight.
Thousands Rally for Internet Freedom in Moscow: Monitoring Group
Protests over the same internet regulation also took off in the southern city of Voronezh and the far east city of Khabarovsk. Thousands of people rallied on the streets of Moscow over the weekend against the proposed Sovereign Internet bill .
It was perhaps a surprise that Diego Simeone's Atletico were overwhelmed so easily.
"The Spanish league is more open, the teams risk more, the priority here is to defend well and then attack".
A second commented: "There is only one GOAT".
Morata also had his side's best effort when he headed over from six yards.
The Juve superstar copied Simeone's "balls" celebration in front of the Juve faithful, with the Argentine having celebrated emphatically after his side made it 2-0 in the first leg. He had played with Real Madrid for almost a decade, leading the Spanish powerhouse to four Champions League titles in five seasons, including in the last three.