行星如何作用于世俗世界，行星是如何影响人生事务的，这是古典占星的核心，也是正确解盘的关键。很遗憾这一重要的原则未受到应有的重视。
“天体以四种方式作用于世俗世界的个体：通过其影响授予偶然事件，通过其影响否定这些事务，通过去除已授予的事务（介于授予和否定之间）或者通过以不同的方式影响授予命主的事务——通过吉凶结果而变好或变差。”
The celestial bodies act on the individual things of the sublunary world in four ways: by granting the accidental things to which they refer by their determinations, by denying these things, by removing what has been granted (which is intermediate between granting and denying), or by affecting in various ways what has been granted to the native—be it good or ill—through fortunate or unfortunate subsequent circumstances.
——《莫林本命占星方法》
“请牢记，行星可以做以下三件事中的一件：行星可以采取行动，创造某些事务、否定某些事务或者摧毁已产生的事务。”
Remember a planet can do one of three things, it can act to create something, to deny something or to destroy something once it has been produced. ——Robert Zoller – Diploma Course in Medieval Astrology
归纳起来，行星的作用有四种：
- 产生宫位事务；——得到
- 否定宫位事务；——得不到
- 摧毁宫位事务；——得到后失去
- 让宫位事务变好/让宫位事务变差；——变好或变坏
以上为本命盘解读之核心。
