The Law of Root and Branch
The corporeal mount before us, called the Mount of Olives, also has spiritual connection with that name. …If one with attainment named this mountain so, he certainly understood everything that is hidden behind this name, unlike a regular person who reads the same name.… [Some time ago] it so happened that a simple person regarded its soil good for olives, or that he saw many olive trees growing on it, or something of the kind [which is why he named this mount thus. The spiritual root is expressed in every detail in all worlds that stem from them].
– Baal HaSulam, Ohr HaBahir (The Bright Light), The Mount of Olives