"Wow what a difference! One would think any rational person would make careful inquiry about one's destination with so much at stake. Peaceful resting is so much not a part of either destination anyway!"
Staff that is true I think we do not use rational at times and it is actually a careful thought on guarding one's mouth and tongue that sort of led to musing on this RIP / He is in peace mantra! Essentially when we utter those words carelessly we could be telling a lie without realising it.
Ginnyrose wrote
"To assure the loved ones of their deceased relative's eternal destiny as being in heaven, I do not think we have the right to say this is the case because we do not know. If you knew the person quite well is another story. But there are folks who will declare all but the most vile folks as being with the LORD upon their death. To me this is issuing a false hope and that is dreadful, IMHO. "
This is my exact sentiment. I find it hard to reassure loved ones by using those words if I do it's like I have made a judgment which could very well be false hence I will be telling and affirming a lie adding on to false hope.
I too have also observed that everyone in the world says their loved ones are in heaven but when it comes to the most evil it's not so. I guess we always have to guard our mouths and thoughts always against sin this RIP is one such lie that can ensnare believers if used carelessly and as Staff pointed out without rationalisation we easily become liars.