妙法蓮華經玄義 4.161

4.161

Second, the stage of nature: having surpassed dry wisdom and attained heat, one is able to advance through initial, middle, and final minds, entering the dharma of summits, up to the supreme worldly dharmas—all are called the stage of nature. In the stage of nature, the skillful means of non-arising and the understanding wisdom are skillful, increasingly superior to before, attaining the water of the nature of resembling untaintedness; hence it is called the stage of nature.