法華經義記 1.111

1.111

「普佛世界六種震動」，此是第四瑞相。普是有緣感佛世界以來皆悉振動，大地常安而今忽動，此即奇事明義，但三乘行人人有六種執，執三因三果言決定、言決定不同，此即驚動執固之心。又一解，爾時六種者，動眾，六道眾生皆成佛也。

"The universal Buddha-world shook in six ways" is the fourth auspicious sign. "Universal" means that all worlds of the Buddha that had the conditions to resonate shook. The great earth is always tranquil but now suddenly shook; this is an extraordinary event to clarify the meaning. Practitioners of the three vehicles individually had six kinds of attachments: attaching to three causes and three fruits, asserting that they are definitely, definitely not the same. This startled and shook their firmly attached minds. Another interpretation is that the "six kinds" at that time refers to stirring the multitudes, so that sentient beings of the six destinies all attain Buddhahood.