Our current relationships are alway representative of our affiliations on other lives. We may follow these correlations to the nth degree. Thus, the delivery person at the door may well represent a human interacting with you in another of your lives, a Past Life, let us say. The telemarketer you have just spoken with on the phone may represent a human from another era with whom you are interacting.
Indeed, the entire workforce at your place of employment may well represent a collective of humans with whom you have associated in other livers. For the Soul Family, broadly defined, incarnates together to work in groups, and learn their Lessons together.