妙法蓮華經玄贊 2.367

2.367

The Commentary says: This concludes and establishes it. The emission of light alerts and awakens, and all those who have affinity gather; the assembly, having seen this, gives rise to deep thirst and yearning, and the raising of this supernatural transformation indicates that the Dharma is not false and clearly reveals the profound secret; therefore it is called emitting light to help the meaning of the true mark.