四明十義書 1.63

1.63

且夫大師垂示觀法皆為除病，揀定識心是病之根穴，乃用十乘法藥委細治之。若將病為藥，是認賊為將，則一部《止觀》皆不堪也。

Furthermore, the contemplation methods passed down by the Great Master are all intended to eliminate sickness. Selecting and determining the conscious mind is identifying the root and acupuncture point of the sickness; only then does one apply the medicine of the ten vehicles of Dharma to treat it in detail. If you take the sickness to be the medicine, that is mistaking a bandit for a general, rendering the entire Zhiguan useless.