妙法蓮華經玄義 4.61

4.61

As for the existence of the Four Heavenly Kings being destroyed by the unmoving samādhi: these devas guard the realm and roam the world, so there is the motion of retribution, as well as the motions of views and thoughts, of dust and sand, of fundamental ignorance, and so on. The bodhisattva cultivates various practices, destroys these motions, and perfects the samādhi. His vows perfume, the capacities and conditions stimulate, and through his original compassion he causes others to destroy the four motions and perfect the three unmoving states; therefore it is named the unmoving samādhi. The details are as explained above.