Buddhism teaches that the diversity of living beings in the world is caused and upheld by intentional acts performed in this and previous lives by karmic trajectories, beings whose continuity through rebirths is not dependent on a transcendent substratum such as a self (ātman), and that the order of beings in the world exactly correlates with the consequences of acts (karrnan) operative for their present life. The central Buddhist doctrine of dependent co-arising (pratītya-samutpāda) shows how these karmic trajectories are sustained by twelve conditions, the primary of which is ignorance. The goal of Buddhists is ultimately to transcend rebirth and attain nirvāṇa. This is possible because the world is both a rebirth realm and a realm in which awakening from ignorance can be attained. The natural world of living beings is a moral order and this moral order functions in a physical setting. The physical setting of the rebirth system is the cosmos as the abode of beings, and the beings participating in the rebirth system constitute the world of living beings. These together constitute the world of rebirth (saṃsāra). By nature in this article is understood that part of the cosmos that constitutes the physical setting of humans and the world of non-human beings also living there – that is, animals and plants. This is, one should note, only a very small part of the Buddhist cosmos, which consists of a huge number of world systems, and which is immense in time and space and eternally manifests and dissolves.
