QUESTION: Why is the Lotus Sūtra difficult to believe and understand while other sūtras are easy to believe and understand?

ANSWER: Various sūtras other than the Lotus are easy to believe and understand because Śākyamuni preached them to suit the capacity of the people to understand without revealing His true intention. On the other hand, in the Lotus Sūtra, Śākyamuni directly revealed His state of mind without compromising with people’s ability for comprehension. Clearly it is the true teaching, which is not easily understood and believed by ordinary people.

Shokyō to Hokekyō to Nan’I no Koto, The Difficulty and Easiness in Understanding the Lotus Sūtra and Other Sūtras, Writings of Nichiren Shōnin, Doctrine 2, Page 282