Juiyan Calls to Himself (GG12)

KOAN:

Every day Master Juiyan used to call to himself, “Master!” and would answer, “Yes!”
Again, he would call, “Thoroughly awake! Thoroughly awake!” and he would answer, “Yes! Yes!”
“Don’t be deceived by others, any day or any time.” “No! No!”

—Gateless Gate Case 12