法華義疏 12.225

12.225

正法五百年、像法一千年，前明正法滅竟入初像法五百年也，今是像法第二五百，即是兩後，故云後世後五百年也。

The correct Dharma lasts five hundred years, and the seminal Dharma lasts one thousand years. Previously it explained that the correct Dharma had ended and one entered the first five hundred years of the seminal Dharma; now it is the second five hundred years of the seminal Dharma, which is thus the 'two laters,' and therefore it says 'the later age, the final five hundred years.'