A renowned Zen master said that his greatest teaching was
this: Buddha is your own mind. So impressed by how profound
this idea was, one monk decided to leave the monastery and
retreat to the wilderness to meditate on this insight. There
he spent 20 years as a hermit probing the great teaching.
One day he met another monk who was traveling through the
forest. Quickly the hermit monk learned that the traveler
also had studied under the same Zen master. "Please, tell me
what you know of the master's greatest teaching."
The traveler's eyes lit up, "Ah, the master has been very
clear about this. He says that his greatest teaching is
this: Buddha is NOT your own mind."