妙法蓮華經玄義 6.79

6.79

今將此依正轉變，待三教作意神通，悉名為麁。譬如圖畫，盡思竭力，終不似真，名之為麁。若明鏡寫容，任運相似，名之為妙。方便神通，譬如麁畫；中道任運，即對即應，譬於淨鏡，故為妙也。

Now, taking these transformations of environment and person, when contrasted with the deliberate supernormal powers of the three teachings, they are all designated as crude. For example, a painting, though one exhausts thought and expends every effort upon it, in the end never resembles reality; this is called crude. But when a bright mirror reflects a face, it resembles it spontaneously; this is called subtle. Expedient supernormal powers are like a crude painting; the spontaneous responsiveness of the Middle Way directly facing and directly responding is like a clear mirror, and is therefore subtle.