In Chapter 21 of the Lotus Sutra, [the Bodhisattvas of the Earth] are given the specific transmission of the Wonderful Dharma of the Lotus Flower Sutra consisting of the teachings, the supernatural powers, the treasury, and the achievements of the Buddha. Therefore, they are responsible for propagating the Lotus Sutra in the Latter Age of the Dharma. Thus, anyone who upholds the Odaimoku in this age is said to be a Bodhisattva of the Earth or, more humbly, one of their followers.
Lotus World: An Illustrated Guide to the Gohonzon