The Stick
Daṇḍa Sutta  (SN 15:9)

Near Sāvatthī. There the Blessed One said: “From an inconceivable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating & 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 & wandering on, sometimes go from this world to another world, sometimes come from another world to this.

“Why is that? From an inconceivable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating & 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.”