The truth of the Self cannot come through one who has not realized that he
is the Self. The intellect cannot reveal the Self, beyond its duality of subject
and object. They who see themselves in all and all in them help others through
spiritual osmosis to realize the Self themselves.
This awakening you have known comes not through logic and scholarship,
but from close association with a realized teacher.
(Katha Up. Part 1, 2:9, p. 85)