800 Years: The Merit of the Reverse Relationship

Those who had neither a chance to hear the Lotus teaching in the past nor the intention of putting faith in the Lotus Sūtra in this life will fall into evil realms anyway. Therefore, they should be forced to hear the Lotus Sūtra, causing them to slander the sūtra, which eventually enables them to attain Buddhahood in the future through the merit of reverse relationship.

Shō Hokke Daimoku-shō, Treastise on Chanting the Daimoku of the Lotus Sūtra, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 22