Chiggalasutta untranslated

Chiggalasutta 01. Once, at the Kūṭagārasālā in Vesālī, Ānanda saw Licchavī youths practising archery, shooting through even a small keyhole (chiggala) without a miss. He reported this to Gotama Buddha, who remarked that those who penetrate the meaning of dukkha, etc., do a far more difficult thing (SN.v.453f).

Chiggalasutta 02. It is more probable that a blind turtle, rising to the surface only once in a hundred years, should put his neck through a yoke (chiggala) with a single hole, floating about in the ocean, than that a fool who has gone to the Downfall should become a man again (SN.v.455; cp. MN.iii.169; Thīg.500).

Chiggalasutta 03. Similar to 2. It is more probable that a turtle, etc...., than that one should get birth in a human form, or that a Tathāgata should arise in the world, or that the Dhamma and Vinaya proclaimed by a Tathāgata should be shown in the world. See also Tālacchiggalasutta (SN.v.456).