BG Chap 15 - The entrapment of the living entity within the tree
Depending upon which branch a living entity is located, he will possess a certain material body and a specific type of senses, and according to the combination of modes that influences that part of the tree, he will be attracted to particular “twigs,” or sense objects. Thus the living entity, traveling from one birth to the next, from the higher branches of demigod life to the lower branches of animal life, seeks pleasure, but in fact attains only further entrapment in fruitive action and future deaths. With the depletion of the enjoyment of the results of previous karma, the impressions resulting from that enjoyment give rise to new karma on the earth planet. After enjoying the results of one’s actions, those actions become stimulus for actions in another human birth. Thus the jīva gets trapped in the cycle of birth and death.