Buddha Abhidhamma - Ultimate Science - BuddhaNet

312
In the past, because a person’s mind is veiled by ignorance
(avijjà), he does not understand the misery of the round of
rebirth (saüsàra). So he performs both wholesome and unwholesome
kammas (saïkhàra). Thus avijjà and saïkhàra belong
to the past.
The past kamma produces rebirth in the present life. Thus
starting from the very moment of conception till death, vi¤¤àõa,
nàma-råpa, saëàyatana, phassa, vedanà, taõhà, upàdàna and kammabhava
arise. So these eight belong to the present.
The kamma-bhava performed in this life produces rebirth in
the form of upapatti-bhava in the subsequent life. The arising, the
existing and the dissolving of upapatti-bhava are called jàti, jarà
and maraõa, respectively. Thus jàti, jarà-maraõa belong to the
future.
(Note that bhava has been divided into kamma-bhava and
upapatti-bhava; the former belongs to the present and the latter,
to the future.)
3 Twenty modes (âkàra)
1 Past Causes (Atãta Hetu)
avijjà, saïkhàra, taõhà, upàdàna, kamma-bhava.
2 Present Effects (Vaññamana Phala)
vi¤¤àõa, nàma-råpa, saëàyatana, phassa, vedanà.
3 Present Causes (Vaññamana Hetu)
taõhà, upàdàna, kamma-bhava, avijjà, saïkhàra
4 Future Effects (Anàgata Phala)
vi¤¤àõa, nàma-råpa, saëàyatana, phassa, vedanà.
When we look at the past period, we see only avijjà and
saïkhàra to be taken as the past causes. But avijjà; is kilesa-vañña-