法華義疏 10.113

10.113

偈文重明誡勸。「佛智叵思議」者，非長非短能示長短，雖示長短未曾長短，故名不思議，若昔短今長何名不思議也？「甚深叵分別」者，此明法身絕四句、超百非，故下文云「非實非虛非如非異」，豈可以常無常等而分別也。

The verses re-elucidate the admonition and exhortation. "The Buddha's wisdom is inconceivable": being neither long nor short, it can manifest length and shortness; though manifesting length and shortness, it has never been long or short; hence it is called inconceivable. If it were short in the past and long now, how could it be called inconceivable? "Profound and impossible to discern": this explains that the dharmakāya cuts off the four propositions and transcends the hundred negations; hence the text below states: "Neither real nor unreal, neither like nor unlike"; how could one discern it by means of permanence, impermanence, and the like?