"Then you are happy if there is a 'like,' if there is no 'like' you are unhappy," she said. "Here, Carlo is saying: 'Not me, but God.'"
"Certainly today, in a society based a little on the ephemeral, on the exaltation of the self, of the ego, and where one forgets the existence of God, Carlo is certainly very prophetic," Salzano added.
"Carlo reminds us of what is most important. The most important thing is to put God in the first place in our life."
Salzano explained that her son lived a very modern life, but for him, "the faith has always been the same for more than 2,000 years; that is, that God exists, he became incarnate, died and rose again for us."
"So Carlo is also a messenger of this ... But bringing it into what is the modern world of young people, so he definitely has a lot to teach," she said.
Another lesson he can show others is the good which can be done right in one's own neighborhood.
Instead of buying himself games, Carlo used his little bit of spending money to purchase things for the homeless in his area, like a sleeping bag.
Her son did not like money to be wasted on useless things, she said, and he did not care about fashion or clothing brands.
Salzano said: "If I said to him: 'Carlo, let's buy an extra pair of shoes,' he would get angry [and reply] 'Mom, one is enough. Let's help the poor.'"
"He was a very, very simple guy. For him, a pair of trousers was as good as another, a pair of shoes was as good as another," Salzano noted.
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In an interview with CNA Newsroom in May 2019, Carlo's mom said "since he was three, four years old, he showed a big interest in Christ, in the Holy Virgin. When we used to take a walk outside, he used to always want to enter inside the church, to say hello to Jesus, and to send kisses to the cross."
Salzano said that she herself "was not the ideal model of a Catholic mother" when her son was born, and "was quite ignorant in faith things." But through Carlo's influence, she came back to the faith.
"So little by little I started to get closer to the Church. I started to go back to Mass. And this was actually because of Carlo. Carlo was for me a kind of little 'Savior,'" she said.
Hannah Brockhaus is Catholic News Agency's senior Rome correspondent. She grew up in Omaha, Nebraska, and has a degree in English from Truman State University in Missouri.