That same retreat season, Ananda asked a question about dependent co-arising, and so the Buddha taught the Bhikkhus about the twelve links in the chain of existence.
He explained “The teaching of dependent co-arising is profound and subtle. Do not think it can be grasped through words or discourse . . .
Contemplate the nature of dependent co-arising during every moment.
When you look at a leaf or a raindrop, meditate on all the conditions,
near and distant, that have contributed to the presence of that leaf or raindrop.
Know that the world is woven of interconnected threads.
This is, because that is. This is not, because that is not.
This is born, because that is born. This dies, because that dies.”
from Old Path, White Clouds: walking in the footsteps of the Buddha
by Thich Nhat Hanh