"The iron mirror needs to be re-polished, and the moon will be full" means: the iron mirror needs to be re-polished, the full moon will be bright, and the light will fill the sky. "When an iron mirror is repolished, the moon will be full" is a fortune-telling saying, which means that people need to re-plan their plans in order to see the future more clearly; what they want will be as smooth and complete as the full moon in the sky.
What does fortune-telling mean?
Fortune-telling refers to the act of speculating on a person's fate, which belongs to the category of metaphysics. The academic study of fortune telling is called Yi Xue, also called numerology. The core of the theory is Yin Yang, Five Elements, Heavenly Stems and Earthly Branches, and Fuxi Bagua. The theoretical system is relatively complex and profound.
Fortune telling in the narrow sense refers to the calculation and prediction of the eight characters of life (four pillars, eight characters, six pillar predictions); fortune telling in the broad sense covers Ziwei Dou Shu, fortune telling (face palmistry), Bagua Six Yao, and odd fortune telling. Men Dunjia, etc., ancient divination, Qingwu, and divination all belong to the category of fortune telling. Fortune telling in society generally refers to predictions based on four pillars and eight characters. It is recorded in the bamboo slips of the Warring States Period that fortune-telling began in the pre-Qin Dynasty.