Quiet and far-reaching: a calm and quiet mind is not moved by other thoughts, and quiet reflection can establish (realize) lofty goals.
This sentence was first written by Liu An in the early years of the Western Han Dynasty and also quoted by Zhuge Liang in the Commandments.
The Fragment of Huainanzi: Main Skills Training
The home of mankind is as bright as the sun and the moon. The same place in the world looks at it with the same eyes, listens to it with the same ears, and looks at it with a raised neck. Therefore, there is no virtue, no peace, no distance, no generosity, no kindness, no concern for the public, and no justice.