the.com/mentor
Someone who hands you the map after burning their own to learn it.
means A trusted, experienced person who guides, advises, and helps develop someone less experienced.
from From Homer's Odyssey: Mentor was the trusted friend Odysseus left in charge of his household and his son Telemachus when he sailed for Troy. The goddess Athena often took Mentor's form to counsel Telemachus, so the name came to mean a wise guide. It entered wider English use partly through Fénelon's hugely popular 18th-century novel Les Aventures de Télémaque, which made Mentor famous all over again.
originNamed for a character Athena disguised herself as
hidden goddessIn the Odyssey, Mentor was literally a god in disguise
two-way streetTeaching others measurably sharpens the mentor's own skills
the paradoxBest ones make themselves unnecessary
shadow sideBad mentors clone themselves instead of growing you