通教之觀智也。言說者。指諸法之事相，觀事相即空，故云無言說。
The way, or teaching, without speech; the school which teaches that speaking of things is speaking of nothing, or the non-existent; the acquisition of truth through contemplation without the aid of words.
一無言說道 指通教的真理，體色空也。諸法色心，如幻如化；幻有的世俗，雖有名字，名字不在內、不在外、不在中間，常自有等，所以幻有，即空真諦。天台四教儀卷一（大四六‧七七七下）：「又從當教得名，謂三人同以無言說道，體色入空，故名通教。」p6408