Matthew, Mark, Luke, John, Peter, etc etc
Do you think they called each other “Saint” all the time?
>> Do you think they called each other “Saint” all the time? <<
Of course not! It would be an outrageous presumption! Since true faith preserves unto death, and they knew of apostates and heretics, how could they know before someone died that a given individual was a saint? Hence, St. Paul asks for prayers for the saints of a given church, but never refers to any individual as a saint.
That’s one of the great misunderstandings of Catholicism: It’s not that people aren’t saints while they are alive; it’s only that they can only be certainly known to be saints after they die. Oh, what a horrifying world it would be if only the persons who were eventually declared to be saints were actually saints!