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Since they were aliens to God, “St Justin is saying that even before the Incarnation those who followed the Divine Word could speak to men – to Jews through the prophets and to outsiders in a purely interior way.” Catholic Apologetics Today, p 146].TxGodfollower #38
How do you get non-Catholic salvation from that quote? Those that receive salvation from Christ are Christians; the quote makes no distinction Catholic or not.
As St Paul teaches in Romans 2:14-16: “For when Gentiles, who do not have the law, by nature do what the law requires, they are a law to themselves, even though they do not have the law. They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them on that day when, according to my gospel, God judges the secrets of men by Christ Jesus.” [op.cit. p 146].
As the Christ founded only His Catholic Church, the reality is that salvation comes only through Her – "the pillar and bulwark of the truth.” (1 Tim 3:16), and no other sect.