Did you know that the term being someone’s “rabbi”, in the context of a business or political relationship, means (with no religious or spiritual significance) “a primary sponsor or protector”, although there’s a second meaning of “mentor or teacher”.
From “Safire’s Political Dictionary” (by William Safire):
rabbi: Sponsor, or sage adviser; mentor.
When given a unique political sense, this word has no religious or spiritual significance. In political relationships, a rabbi is primarily a sponsor or protector, although there is a second meaning of mentor or teacher.
Safire then compares the term rabbi (in the above context) to the term “guru” and notes that “In political usage, guru is for outsiders, rabbi is for insiders.”