At Savatthi. There the Blessed One said: "From an in construable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating and wandering on. Just as a stick thrown up in the air lands sometimes on its base, sometimes on its side, sometimes on its tip; in the same way, beings hindered by ignorance and fettered by craving, transmigrating and wandering on, sometimes go from this world to another world, sometimes come from another world to this.
"Why is that? From an in construable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating and wandering on. Long have you thus experienced stress, experienced pain, experienced loss, swelling the cemeteries -- enough to become disenchanted with all fabricated things, enough to become dispassionate, enough to be released."