仏教では過去・現在・未来を合わせて三世という。
In Buddhism, the past, present, and world to come are together called the three worlds.
二人は未来でも必ず結ばれようと誓い合った。
The two vowed to be united again in the world to come.
彼は現世の行いが未来の果報を決めると説いた。
He taught that one's deeds in this life determine one's lot in the life to come.