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That he was 99 years old might not be a matter of contention, but what about the rest of what's being said?
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When his death is mentioned on broadcast media, from what I've heard more than half the time they say, "He was America's pastor."
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Pat Boone was a caller on a radio program this past Wednesday, with some memorable comments. I took notes:
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"We have no question where he is, and there is no reason to be sad! Even those who did not believe the things Billy did, recognized him for the upright character he personified, with never a scandal, never a question against him for how he lived his life. We can know that the very second after he left his body like a crocus, that very instant he heard his welcome in heaven: Well done, good and faithful servant! I feel as if he is sitting right next to Jesus -- Who, we know, is sitting at the right hand of the Father."
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It seems to me Pat Boone might be trying to get a leg up on the competition. What do you think? 
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Here's what this prot pastor says, it kind of amazes me.

Lots of erroneous comments about God's Mercy and Graham's ignorance, typical of today's Catholics who really do no believe in EENS.

Billy Graham was a 33rd degree mason. He knew what he was doing.

St. Peter Julian Eymard – Bad Catholic vs Good Protestant

People often say, “It is better to be a good Protestant than a bad Catholic.” That is not true! That would mean that one could be saved without the true faith. No. A bad Catholic remains a child of the family, although a prodigal; and however great a sinner he may be, he still has a right to mercy. Through his faith, a bad Catholic is nearer to God than a Protestant, for he is a member of the household, whereas the heretic is not. And how hard it is to make him become one!
St. Peter Julian Eymard

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Thank you for this from St. Peter Julian Eymard. He was a great exponent of the Blessed Sacrament and that carries through in all his writings. Obviously, the Faith of Catholics is inherently tied to the Eucharist, which is something that all Protestants miss out on entirely. It is Catholic dogma that proper reception and true faith in the Real Presence is a necessity for eternal salvation, which is why the Eastern Churches administer the Holy Eucharist even to children just after their Baptism.
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I think that we should pray for him that he may rest in peace.

Do you pray for Adolph Hitler?

Regarding prayer for Billy Graham:  hasn't his soul already been judged by God? Isn't particular judgment immediate?

That's the wrong way to think. God takes all prayers into account. But that includes prayers before, during, and after a person's death. God is above and outside of time, remember that.

There's a reason why bodies don't immediately manifest where the soul went. God could make all the bodies of damned souls stink accordingly, and the bodies of the Just could all be like the saints' bodies (heavenly fragrance, incorrupt) but such is not God's will. Furthermore, the Church doesn't have an inverse Canon of non-saints, or a catalog of the Damned. We are always encouraged to pray for the dead, but of course keeping in mind that there is not an equal "hope for salvation" among all those who have died. In, fact, the Church has regulations on things like who can be buried in a Catholic cemetery. 

But we must not bring God down to our human level, we who are slaves of (rather than masters of) Time.

Being above time is one of the things only God enjoys, which is why there will never be a "Time Machine" no matter how many humans fantasize about the idea. There will never be a device that will bring us even 1 minute forward or backwards in time.

Being bound by time is part of being a creature.

Regarding prayer for Billy Graham:  hasn't his soul already been judged by God? Isn't particular judgment immediate?

Yes, Billy Graham has been judged by God. This particular judgement is immediate. However what that judgement is is only known to God. We don't know the particulars of Billy Graham's situation. Therefore the charitable thing is to pray for the repose of his soul.