Karma is the life sustaining force and is the cause of birth. The body is the instrument of the vital force. Every action done by man is termed as karma. Man performs actions for the fruits thereof. He takes birth again to experience the results of his actions. Hence, it is considered that man's life in this world is bound by karma. Man cannot get away from action. Man's condition in life is dependent by his actions, and his habits are then governed by the actions. Habits determine conduct, and conduct determines his future. Hence, it is very important how we act. Good and evil in life are determined by the nature of our actions.
(Gems Of Wisdom, Karma, pg 89)