On the Great Realization (Daigo) by Dogen - a qoute

[Mornings Sun]

As to a person who has experienced the great realization, we cannot say that
the great realization has been with that person from the outset, nor has that person,
upon experiencing the great realization, stored it up somewhere outside or apart
from himself, nor is the great realization something encountered in the human
world only by those who are in the last stages of old age. Such a person does not
forcibly drag it out of himself, yet, without fail, such a one experiences the great
realization. Such a one does not treat merely an absence of delusion as the great
realization. Neither does such a one aim at becoming a deluded person first so that
he may then plant and sprout the seeds of the great realization. Moreover, although
a person of great realization experiences the great realization, a person of great
delusion also experiences the great realization. Just as there are persons of great
realization, so there are Buddhas of great realization, and there is earth, water, fire,
wind, and space in the great realization, and there are pillars* of the temple and
stone lanterns* in the great realization. We are now raising questions about those
who have experienced the great realization. The question about those who have
experienced the great realization being capable of reverting to delusion is asking
something that truly needs to be asked. And Kegon does not shun the issue, for he
cherishes the old ways in monastery life, since they are the meritorious ways of the
Buddhas and Ancestors.