The fifth volume of Great Concentration and Insight states, “As practice progresses and understanding grows, the three obstacles and four devils emerge in confusing form, vying with one another to interfere.” It also states, “It will only be like a boar rubbing against the golden mountain; like the various rivers flowing into the sea; like logs making a fire burn more briskly; or like the wind swelling the body of thekālakula insect.” These passages mean that, if one understands and practices the Lotus Sutra just as it teaches, in accordance with the people’s capacity and at the right time, then these seven obstacles and devils will confront one. Among them, the devil king of the sixth heaven[is the most powerful. He] will possess one’s sovereign, parents, wife or children, lay supporters, or evil persons, and through them will attempt in a friendly manner to divert one from one’s practice of the Lotus Sutra, or will oppose one outright. The practice of Buddhism is always accompanied by persecutions and difficulties corresponding in severity to whichever sutra one may uphold. To practice the Lotus Sutra will provoke particularly harsh persecutions. To practice as it teaches, and in accordance with the time and the people’s capacity, will incite truly agonizing ordeals.
For entire Gosho see:http://www.nichirenlibrary.org/en/wnd-1/Content/93