Originally Posted by
LFJ
You'll learn from a Buddhist perspective that Karma, although divided into action of body, speech, and mind, is basically of one type. All such action is led by the intent, the 7th mental consciousness (manas-vijñāna/ 意), whether that manifests through external, visible (bodily), audible (speech), or internal (mind) action. It is all action of the intent.
In order for an action to accrue karmic debt, it must be led by the intent. Otherwise, the consciousness is not involved so how can it accrue such debt? For example, unknowingly stepping on a bug. To believe that will have negative karmic effects requires one to have a Hindu/Jain understanding of Karma as any action whatsoever, because the manas-vijñāna (thought consciousness/karma) is not involved.
This is not just my understanding, or my definition, this is the Buddhist teaching on Karma. I suggest you look into it.