Every level needs to be elevated.
How does a 'medaber' (the highest level) get elevated?
When a PERSON puts his OWN INTELLECT (which defines him as a person) aside, and does what Hashem wants ONLY because HE said so - THAT is Kabolos Ol.
That is the way he elevates himself.
Kabolos ol - is the foundation.
A person is compared to a tree.
The roots of a tree is the foundation of the tree.