Bhavanasutta 6.1

6.1

Seyyathāpi, bhikkhave, sāmuddikāya nāvāya vettabandhanabaddhāya cha māsāni udake pariyādāya hemantikena thale ukkhittāya vātātapaparetāni bandhanāni, tāni pāvussakena meghena abhippavuṭṭhāni appakasireneva parihāyanti, pūtikāni bhavanti.

Suppose there was a sea-faring ship bound together with ropes. For six months they deteriorated in the water. Then in the cold season it was hauled up on dry land, where the ropes were weathered by wind and sun. When the monsoon clouds soaked it with rain, the ropes would readily collapse and rot away.