Yunmen's Day of the Full Moon (BCR6)

KOAN:

Yunmen said, “I’m not asking you about before the full moon. Come and say a word or two about after the full moon.”
He responded to his own request, “Every day is a good day.”

—Blue Cliff Record Case 6 (transl. by John Tarrant & Joan Sutherland, titled: Yunmen’s Good Day)