明鏡 めいきょう止水 しすい
meikyōshisui

Noun

1. clear and serene (as a polished mirror and still water)

Yojijukugo
わたくし こころ明鏡 めいきょう止水 しすいだ。
watashino kokorowa mēkyōshisuida
My mind is as bright and clean as a stainless mirror.