Brahmajalasutta 3.72.3

3.72.3

Seyyathāpi, bhikkhave, dakkho kevaṭṭo vā kevaṭṭantevāsī vā sukhumacchikena jālena parittaṃ udakadahaṃ otthareyya. Tassa evamassa: ‘ye kho keci imasmiṃ udakadahe oḷārikā pāṇā, sabbe te antojālīkatā. Ettha sitāva ummujjamānā ummujjanti; ettha pariyāpannā antojālīkatāva ummujjamānā ummujjantī’ti;

Suppose a deft fisherman or his apprentice were to cast a fine-meshed net over a small pond. They’d think: ‘Any sizable creatures in this pond will be trapped in the net. Wherever they emerge they are caught and trapped in this very net.’