The metaphor shows correctly not only the spontaneity and nature of intuitive knowledge but also the sequence of the realization.Furthermore, it shows its intimacy and simplicity.

• 它既贴切地指示出良知的自发性、自然性,又生动地表示出良知实现的次第性,更准确的显示出致良知功夫的亲近性、简易性。