Yoshiro Tamura, "Introduction to the Lotus Sutra", p101-102Since we have surveyed the Lotus Sutra according to the traditional view of its division into two parts, and have already seen that there are three parts to the sutra with regard to its historical formation, we need to look at one more part and describe its distinctive teachings. This part consists of chapters 10-22, which overlap both of the traditional two divisions. …
As we have seen in the section on the historical formation of the sutra, this part of the sutra was composed as one group in accord with a consistent intention: it was done to emphasize bodhisattva practice. Bodhisattva practice means human activity in the world, which is the characteristic idea that runs continually through this group of chapters, from the beginning to the end.