“From ancient times in both East and West, man's mind has been likened to a mirror. When something comes in front of it, it is reflected, but when the thing goes away, its image disappears without leaving a trace. Even though the mirror may reflect something dirty, it is not soiled. The mind is the same. If it is not enslaved to anything, it will reflect a thing exactly, but when the thing leaves, its form will not remain. The self is restored to a clean slate and returns to an absolutely new beginning, prepared to reflect accurately all things at any time.”
Book:Zen and the Bible