From whence does the thought 'I' arise?
I think
this is indeed this is a very fundamental question... but it does
not require an answer from thought. Turn the mind inwards to its
origin... because you can only be the truth, you cannot know it as
an object. Thoughts arise and dissolve in our True Mind.
True Mind
There are not many arts to Zen study: it just requires knowing your
own true mind. Now observe that within this body the physical
elements combine temporarily, daily heading for extinction: where
is the true mind?
The flurry of ideas and thoughts arising and passing away without
constancy is not the true mind. That which shifts and changes
unstably, sometimes good, sometimes bad, is not the true mind. That
which wholly depends on external things to manifest, and is not
apparent when nothing is there, is not the true mind.
Suppose you turn the light of awareness around to look within, and
sense tranquility and oneness; do you consider this the true mind?
You still do not realize that this tranquility and calm oneness are
due to the perception of the false mind: there is subjective mind
perceiving and the object perceived. This tranquility and oneness
belong to the realm of inner states. This is what is meant by the
Heroic Progress Sutra when it says, "Inwardly keeping to
tranquility is still a reflection of discrimination of objects."
How could it be the true mind?
So if these are not the true mind, what is the true mind? Try to
see what your true mind is, twenty four hours a day. Don't try to
figure it out, don't try to interpret it intellectually, don't try
to get someone to explain it to you, don't seek some other
technique, don't calculate how long it may take, don't calculate
your own strength, just silently pursue this inner investigation on
your own: "Ultimately what is my own true mind?"