The only way to receive trustworthy contact with the spirit of a departed loved one is by prayer and silence, practised at the same time every night. There may only be a sense of the other's presence, or there may be a clear message imparted, possibly, in a dream. Patience is needed. Moreover, this cannot be repeated more than a few times.
-- Notebooks Category 9: From Birth to Rebirth > Chapter 1: Death, Dying, and Immortality > # 153