Think on This...
(Q) Please explain for me what is meant by "soul-mate" . . . (A) Those of any sect or group where there is the answering of one to another; as would be the tongue to the groove, the tenon to the mortise; or in any such where they are a complement one of another--that is what is meant by "soul-mate." Not that as from physical attraction, but from the mental and spiritual help.
Edgar Cayce Reading 1556-2