When gazing at the moon, around the time he got the idea to become a monk.

かくばかりへがたく見ゆる世の中にうら山しくもすめる月かな

kaku bakari Fegataku miyuru yo no naka ni urayamasiku mo sumeru tuki kana

When so very Hard it seems to pass through This mundane world Indeed, I envy The moon, dwelling there, so clear!

Fujiwara no Takamitsu