" Intellectual knowledge exists in and of the brain.
Because the brain is part of the body, which must one day expire, this collection of facts, however large and impressive, will expire as well.

Insight, however, is a function of the spirit.
Because your spirit follows you through cycle after cycle of life, death, and rebirth, you have the opportunity of cultivating insight in an ongoing fashion.
Refined over time, insight becomes pure, constant, and unwavering.

This is the beginning of immortality. "

― Lao Tzu