Job 14:21 His sons come to honour, and he knoweth [it] not; and they are brought low, but he perceiveth [it] not of them. 

Psalm 146:4 His breath goeth forth, he returneth to his earth; in that very day his thoughts perish.
Ecclesiastes 9:5 For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
9:6 Also their love, and their hatred, and their envy, is now perished; neither have they any more a portion for ever in any [thing] that is done under the sun.
Psalm 6:5 For in death [there is] no remembrance of thee: in the grave who shall give thee thanks?
(Knowing the condition is important because often people are deceived to think that it is their deceased loved ones who are visiting them when really it is devils.)
Isaiah 8:19 And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? [Not] the living to the dead?
1 Timothy 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
Other texts on supernatural contact: Leviticus 19:31, 1 Chronicles 10:13 & 14, Malachi 3:5, Jeremiah 27:9 & 10, Deuteronomy18:10-13, Leviticus 20:27,Galatians 5:20-23.
Phil Blake   January 2011