妙法蓮華經玄義 8.50

8.50

心為善語教者，法之與語，俱通善惡，今以善法善語定之，心之與觀亦通善惡，今以善心善觀定之，即是善語教、善行、善理故，心具三義。

As for the mind being good spoken teaching: dharmas and words both extend to good and evil, but now they are defined by good dharmas and good words; the mind and contemplation also extend to good and evil, but now they are defined by the good mind and good contemplation; because they are good spoken teaching, good practice, and good principle, the mind possesses the three meanings.