What does this passage from CCC mean?

" 2478 To avoid rash judgment, everyone should be careful to interpret insofar as possible his neighbor’s thoughts, words, and deeds in a favorable way:
Every good Christian ought to be more ready to give a favorable interpretation to another’s statement than to condemn it. But if he cannot do so, let him ask how the other understands it. And if the latter understands it badly, let the former correct him with love. If that does not suffice, l*et the Christian try all suitable ways to bring the other to a correct :confused:interpretation/U]:confused::confused::confused: so that he may be saved.280"

Why would it be necessary that an unbeliever correctly understand something to be saved?*

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