Anti-Fear said:
I mean, can they hear me if I speak to them? Or maybe peek into mind, yes?
It would make sense, if the Catholic doctrine regarding the Communion of Saints is true, that yes, God permits them to be aware of our prayers (which in a sense can be considered a "peek into our mind" and thoughts) when we ask for their intercessioin of prayer. Of course, this would be due to God granting them this grace and not of their own doing, since they are not "mini-gods" or anything like that; they are not omniscient, as God is.
Because if the Saints are deceased from this world and they can hear me, does this apply to non-Saint people?
You mean like those in hell? Good question. While it's possible, it doesn't necessarily mean it
is so. Because if God permits this of those experiencing heaven it doensn't necessarily follow from this that this would also "have" to be the case with respect to those experiencing hell, since it would also make sense that those experiencing heavenly glory are likely to receive graces from God that are not received by those experiencing hell. In that vein, this
could be something that those experiencing heaven are permitted that those experiencing hell are not. Then again, since negromancy and divination are prohibited by God, it stands to reason that God also (at least at times) permits other than those experiencing heaven to have some degree of awareness of those still on earth. So who knows. If they are, though, it would, again, be due to God permitting it and making it possible and not due to any of their own doings or any "power" of their own, not granted by God.