妙法蓮華經玄贊 2.224

2.224

Commentary: This explains its meaning. What is the intent of emitting the light? He wishes to cause them to hear and know the Dharma that is difficult to believe. Formerly he taught two truths, but now he discusses the single reality, causing them to abandon the old ultimate and adopt the new ultimate; therefore it is called “difficult to believe.” Not only is faith difficult, the doctrine and purport are also difficult.