"The law of karma is a special instance of the law of cause and effect, according to which all our actions of body, speech, and mind are causes and all our experiences are their effects."

Geshe Kelsang Gyatso (1)

This is the most satisfying definition of Karma that I have come across.

 I came to the notion of through Dostoyevsky's Crime and Punishment. Dostoyevesky's intent is to demonstrate how

 

 

(1) 1931-, Kelsang Gyatso, Geshe, (1995). Joyful path of good fortune : the complete guide to the Buddhist path to enlightenment