Zen students are with their masters at least ten years before they presume to teach others. Nan-in was visited by Tenno, who, having passed his apprenticeship, had become a teacher. The day happened to be rainy, so Tenno wore wooden clogs and carried an umbrella. After greeting him Nan-in remarked: “I suppose you left your wooden clogs in the vestibule. I want to know if your umbrella is on the right or left side of the clogs.”
Tenno, confused, had no instant answer. He realized that he was unable to carry his Zen every minute. He became Nan-in’s pupil, and studied six more years to accomplish his every-minute Zen.
from 101 Zen Stories
as printed in Zen Flesh, Zen Bones