All Buddhas and all ordinary beings are nothing but the one mind.
This mind is beginningless and endless, unborn and indestructible.
It has no color or shape, neither exists nor doesn't exist, isn't
old or new, long or short, large or small, since it transcends all
measures, limits, names, and comparisons. It is what you see in
front of you.
Start to think about it and immediately you are mistaken. It is
like the boundless void, which can't be fathomed or measured. The
one mind is the Buddha, and there is no distinction between Buddha
and ordinary beings, except that ordinary beings are attached to
forms and thus seek for Buddhahood outside themselves. By this very
seeking they lose it, since they are using Buddha to seek for
Buddha, using mind to seek for mind. Even if they continue for a
million eons, they will never be able to find it. They don't know
that all they have to do is put a stop to conceptual thinking, and
the Buddha will appear before them, because this mind is the Buddha
and the Buddha is all living beings. It is not any less for being
manifested in ordinary things, nor any greater for being manifested
in Buddhas.
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This pure mind, which is the source of all things, shines forever
with the radiance of its own perfection. But most people are not
aware of it, and think that mind is just the faculty that sees,
hears, feels, and knows. Blinded by their own sight, hearing,
feeling, and knowing, they don't perceive the radiance of the
source. If they could eliminate all conceptual thinking, this
source would appear, like the sun rising through the empty sky and
illuminating the whole universe. Therefore, you students of the Tao
who seek to understand through seeing, hearing, feeling, and
knowing, when your perceptions are cut off, your way to mind will
be cut off and you will find nowhere to enter. Just realize that
although mind is manifested in these perceptions, it is neither
part of them nor separate from them. You shouldn't try to analyze
these perceptions, or think about them at all; but you shouldn't
seek the one mind apart from them. Don't hold on to them or leave
them behind or dwell in them or reject them. Above, below, and all
around you, all things spontaneously exist, because there is
nowhere outside the Buddha mind.
~ Zen Master Huang Po