明鏡止水
めいきょうしすい (meikyō shisui)
A calm and clear mind, free from distractions.
Example 1Basic Example
彼の心は明鏡止水で、動揺の色がなかった。
His mind was calm and clear, without a hint of disturbance.
Example 2Applied Example
彼の心は明鏡止水のように静まり返っていた。
His mind was as calm and clear as a polished mirror and still water.