妙法蓮華經玄贊 3.151

3.151

贊曰：自下文第三依何等義，有二：初略標、後廣解。此初也。因前文起，故假徵顯有何所以？言辭難解唯佛知也，依何等義作如是說？「諸佛世尊」者，總苞十方三世諸佛。「唯以一大事」者，事物、體事、事義、道理隨應皆得。為此大事因緣，所以出現世間，自稱德號廣利眾生，不爾便如二乘入滅。由此大事，故隨宜說意趣難知。

The Commentary says: From this passage below is the third [part], relying on what meaning, which has two parts: first, a brief statement; second, a detailed explanation. This is the first. Arising from the preceding text, a rhetorical question is therefore posed to make evident: what is the reason for this? The words and phrases are difficult to understand, known only to buddhas; relying on what meaning did he speak like this? "The buddhas, the Bhagavats" comprehensively encompasses the buddhas of the ten directions and three times. Regarding "solely for one great matter", [matter means] affairs, substantial affairs, the meaning of affairs, or principle, as appropriate in each case. For this great matter of causes and conditions they therefore appear in the world, proclaiming their virtuous titles to broadly benefit sentient beings; otherwise, they would enter extinction like the two vehicles. It is on account of this great matter that what is spoken in accord with suitability has a purport that is difficult to understand.