舜日尧天

shùn rì yáo tiān

sage Emperors Shun and Yao rule every day (idiom); all for the best in the best of all possible worlds

舜

shùn

Shun (c. 23rd century BC), mythical sage and leader

日

rì

abbr. for 日本[Ri4 ben3], Japan

尧

yáo

surname Yao

天

tiān

day