妙法蓮華經玄義 2.6

2.6

Regarding the profundity of the dharmas of buddhas: as the sūtra says, 'Stop, stop! There is no need to speak; my Dharma is wondrous and inconceivable.' The dharmas of buddhas do not go beyond the provisional and the real: 'This Dharma is extremely profound and wondrous, difficult to see and difficult to comprehend. Among all classes of sentient beings, none can know the Buddha'—this is the profundity of the real wisdom. 'And as for the Buddha's other various dharmas, likewise none can measure them'—this is the profundity of the Buddha's provisional wisdom. As for these two dharmas, only a buddha together with a buddha can exhaustively fathom the real mark of all dharmas; this is called the profundity of the dharmas of buddhas.