宏智禪師廣錄 2.17

2.17

Medicine becoming disease was observed by former sages;
Disease becoming medicine—who must it be?
White head and black head—sons who can carry on the house;
Affirmative phrases and negative phrases—the dynamism that cuts off the flow.
Majestically sitting to cut off the tongue's path,
They surely laugh at the old awl of Vaiśālī.