法華義疏 8.300

8.300

「我滅度後」下，第四段，明未來相值，即出下根人也。此是佛滅度後修道成阿羅漢，此人命終生於淨土，釋迦於淨土中作佛更有異名，為此人說《法華經》方乃得悟。所以說此事者，明無有畢竟永住二乘，會須聞《法華》後當成佛，勵下根人令及時信受。

From "After my extinction" onwards is the fourth section, explaining their meeting one another in the future, which specifically brings out persons of dull faculties. This refers to those who cultivate the path after the Buddha's extinction and become arhats; when such persons' lives end, they are born in a pure land, where Śākyamuni acts as a buddha under another, different name, and preaches the Lotus Sūtra for these persons so that they only then attain awakening. As for why this matter is stated: it makes clear that there is no one who ultimately and permanently abides in the two vehicles; they must inevitably hear the Lotus Sūtra and will afterwards become buddhas, thus encouraging persons of dull faculties to faithfully accept it in good time.