The Lotus Sutra can be seen as a book of prophetic teachings. For this reason, Nichiren called these teachings “narratives of the Buddha in the future.” These narratives of the future, however, do not merely prophesy what will happen in coming generations. Their point is that Sakyamuni teaches living beings how to perform practices in an era when he does not physically exist. Since the words of the Buddha are true, we are expected to accept them as the Truth, and we are all required to follow the teaching
Nichiren actually put into practice what the Lotus Sutra had expounded concerning its propagation in the future. His determined efforts, however, raised opposition, which led to persecutions.
Introduction to the Lotus Sutra