Saint Paisos prayed for the the wicked and even demons, confident that prayers for the dead and demons not only limit suffering, but can liberate the damned. My priest in Danbury CT said that prayers avail all, but their eternal destination remains unchanged (i.e. a damned person is still damned, but maybe it is less bad). I have seen priests take opposite sides on this issue. Can I get some comments and insight on this?
As far as I'm aware, the Church has no definite stance on what may be accomplished. We do not teach that someone can be "prayed to salvation" after they have died.
However, we do understand that God would foresee such prayers, since He us not limited by time.
Also, we most often pray for God's mercy, without telling Him what form that should take.
Further, we do not say that God cannot do whatever He wishes with a soul, in His mercy, before or after they die.
I know many Protestants teach that God is limited by cosmic laws of justice that prevent His mercy acting in any way He might choose, but we do not believe this.
There is a great deal mire that can be said, but that's a start.
Oh, and we may trust the Saints in general, more so perhaps on certain things, depending on their agreement and other things, but we do not regard any man as infallible (except the Man Christ, of course) ... so even though they are recognized as being pleasing to God, we do not say they cannot be wrong about something or other.