A glass of milk and an empty glass on the table in front of them. Monk and local lad. The most perceptive monk, the least perceptive lad. Out of his tunic, the monk, he produced three lemons. Three should be enough, he supposed. Give me your knife. The boy produces a rudimentary looking implement. Brother Urineface slits the lemons and squeezes the lemons into the empty glass. Now pay attemtion. Boy looks blankly at him. Not at me, at the glass, boy. Boy looks at glass of milk. This, monk places his fingers gently on the rim of the glass of milk, is life. And this, lifts up the glass of lemon juice, represents mind. Got that? Boy nods. The monk then pours the lemon juice into the glass of milk filling it almost to the brim. The two watched as slowly the milk curdled. That’s what happens. Eh? said the boy. Obviously confused. Mind changes life, barked Urineface abruptly. End of lesson.