Saṃyutta Nikāya 56
Connected Discourses on the Truths
“Bhikkhus, suppose a man were to cut up whatever grass, sticks, branches, and foliage there is in this Jambudipa and collect them into a single heap. Having done so, he would impale the large creatures in the ocean on the large stakes, the middle-sized creatures on the middle-sized stakes, and the small creatures on the small stakes. Still, bhikkhus, the gross creatures in the ocean would not be exhausted even after all the grass, sticks, branches, and foliage in Jambudipa had been used up and exhausted. The small creatures in the ocean that could not easily be impaled on stakes would be even more numerous than this. For what reason? Because of the minuteness of their bodies.
“So vast, bhikkhus, is the plane of misery. The person who is accomplished in view, freed from that vast plane of misery, understands as it really is: ‘This is suffering.’… ‘This is the way leading to the cessation of suffering.’