When Billy-Bob Gautama was a young man, he met a great teacher, and soon the two of them were engaged in deep conversation about the Manifold Path and the Four Virtues.  As they spoke, the teacher poured beer into Billy-Bob’s glass.  When the glass was full, he kept pouring, and soon the beer spilled onto the table.  “Now wait,” said Billy-Bob.  “That glass won’t hold any more.”  “That is right,” said the teacher.  “And if you don’t empty your mind, no new wisdom can enter it.”  “I get that,” said Billy-Bob.  “But if you don’t quit spilling my beer, I’m going to kick your ass.”  Thus the teacher was Enlightened.