法華義疏 2.28

2.28

'The dharma that instructs bodhisattvas': namely, expounding that the single signless dharma produces all dharmas, in order to instruct bodhisattvas whose faculties are mature. When bodhisattvas cultivate this dharma, their practice corresponds with the Buddhas; therefore, they are guarded and kept in mind by the Buddhas. Blocking the external evils of ordinary people and the two vehicles is 'guarding'; causing them to generate the correct contemplation of the Middle Way is 'keeping in mind.'