Karma: the manifestation of the confused mind

Sometimes the mind is influenced by ego-clinging or selfishness. Sometimes the mind is influenced by strong anger or aggression and sometimes by strong desire or attachment, pride, or jealousy. 
All of these emotional states cause the mind to create ideas and to perform actions that create what we call a karmic potential, a karmic seed. These karmic seeds are collected in the mind where they continue as habitual tendencies. As these tendencies ripen, as the karma created by confused thought or action comes to full fruition, this produces the experience of an event in our impression of the world around us. This is our karma, the manifestation of the confused mind. 
~ Kunzig Shamar Rinpoche (Shamarpa)