Saṃyutta Nikāya 56
Connected Discourses on the Truths
48. Yoke with a Hole (2)
“Bhikkhus, suppose that this great earth had become one mass of water, and a man would throw a yoke with a single hole upon it. An easterly wind would drive it westward; a westerly wind would drive it eastward; a northerly wind would drive it southward; a southerly wind would drive it northward. There was a blind turtle which would come to the surface once every hundred years. What do you think, bhikkhus, would that blind turtle, coming to the surface once every hundred years, insert its neck into that yoke with a single hole?”
“So too, bhikkhus, it is by chance that one obtains the human state; by chance that a Tathagata, an Arahant, a Perfectly Enlightened One arises in the world; by chance that the Dhamma and Discipline proclaimed by the Tathagata shines in the world.