[2003] A phenomenon (dhamma) with a future object is a condition for a phenomenon with a present object by decisive-support condition (upanissaya-paccaya).
Natural decisive support (pakatūpanissaya): contemplation of impermanence (aniccānupassanā), contemplation of suffering (dukkhānupassanā), and contemplation of non-self (anattānupassanā) with a future object are a condition for contemplation of impermanence, for contemplation of suffering, and for contemplation of non-self with a present object by decisive-support condition.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.