正像には西より東に向い末法には東より西に往く - The same is true of Buddhism. It spread from west to east in the Former and Middle Days of the Law, but will travel from east to west in the Latter Day.

本文
月は西より出でて東を照し 日は東より出でて西を照す 仏法も又 以て是くの如し
正像には 西より東に向い 末法には 東より西に往く

顕仏未来記

（５０８頁）

文永１０年５月

（１２７３年）

通解（意訳）
月は西から出て東を照らし、日は東から出て西を照らす。仏法もまた、この大宇宙の法則の通りである。
正法・像法時代には、仏法は西のインドから、中国、朝鮮、日本へと東へ伝わり、代わりにその国々の仏法は、本質を失って形骸化してしまった。
しかし、釈尊の説いた法華経に予言された通り、末法に入ったなら、東の国・日本で、地涌の菩薩である法華経の行者が出現し、仏法の真髄である『南無妙法蓮華経』の大仏法を説き明かし、東のこの日本から西へと流布し、世界中に広く流布されてゆくのである。

英語で御書
Gosho in English
The moon appears in the west and sheds its light eastward, but the sun rises in the east and casts its rays to the west. The same is true of Buddhism. It spread from west to east in the Former and Middle Days of the Law, but will travel from east to west in the Latter Day.

" On the Buddha’s Prophecy "

"The Writings of Nichiren Daishonin", Vol.1, p. 401

May, 1273.

[ --- ] is liberal translation.

Interpretation (liberal translation)
The moon appear from the west and go to the east, the sun rising of the east and illuminates the west.
Buddhism is also matching to the principle of this universe.
In the Former and Middle Days of the Law, Buddhism was transmitted from India in the West to the Easts, China, Korea, and Japan. But the Buddhism of these countries lost its essence and became formal.
However, in the Latter Day of the law, as prophesied by the Buddha's Lotus Sutra, the followers of the Lotus Sutra called the bodhisattva of the earth appear in the east country of Japan.
The person emerge and preach to the true essence of the Buddhism, its "Nam-Myoho-Renge- Kyo" from Japan in the east to the west, and it will spread  widely all over the world. 

参考文献：
「日蓮大聖人御書全集」
「御書をひもとく」
「英語で学ぶ御書」
第三文明社
Bibliography :
"The Writings of Nichiren Daishonin"
"The Record of The Orally Transmitted Teachings"