Old Buddha said:
"When hungry, eat; when tired, sleep.
The hearth flames will fill the sky."
"When hungry" means the lives
of those who have eaten rice.
Those who have not yet eaten rice
are the people who are not hungry yet.
However, you should understand
that we whose hunger is our daily life
must affirm that it is ourselves who have eaten rice.
"Tired" means tiredness within tiredness.
It is tiredness that includes the totality of tiredness.
For this reason,
it is this present moment
when the life of the whole body (and mind) is
completely unified with the whole body.
Sleep" means sleeping with the eyes of the Buddha,
the eyes of the Dharma, the eyes of insight,
the eyes of the ancestors,
and the eyes of round pillars and lanterns.
from:
How to raise an ox
Zen master Dogen's Shobogenzo
