摩訶止觀 2.67

2.67

又行中寂然有定相，若不察之，於定生染，貪著禪味。今觀定心，心尚無心，定在何處？當知此定從顛倒生。如是觀時，不見於空及與不空，即破定相，不生貪著，以方便生，是菩薩解。

Furthermore, within walking there is a quiescent characteristic of concentration. If one does not scrutinize it, defilement will arise toward concentration, coveting the flavor of dhyāna. Now, contemplating the concentrated mind: if the mind does not even exist as mind, where is concentration? One should know that this concentration arises from inversion. When contemplating in this manner, one sees neither emptiness nor non-emptiness; this immediately shatters the characteristics of concentration so that covetous attachment does not arise, and by means of skillful means, arising occurs. This is the bodhisattva's understanding.