Dear ask21771
You tube you will find several testmony about ust to surface on this subject but if you reaaly wnat to know sugest to study both books below (they are old more than 150 years and most of people dont know about):
The Gospel According to Spiritism - Allan Kardec chap.IV §4
The Spirits’ Book - Allan Kardec: questions 166;330
You can find bok both free for download at:
http://www.ssbaltimore.org/e-books.html
Good study!