[217] Bhikkhus, suppose there were a great tree, and all its roots — both those that go downward and those that go crosswise — convey the sap upward. Then indeed, bhikkhus, with that as its nutriment, with that as its sustenance, that great tree would stand for a long, long time. So too, bhikkhus, for one who dwells contemplating gratification (assāda) in things that can fetter, there is the descent of name-and-form (nāmarūpa). With name-and-form as condition, the six sense bases (saḷāyatana) come to be … Such is the origin of this entire mass of suffering (dukkha).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.