"OM"

The imperishable sound,
is the seed of all that exists.
The past, present, the future,
all are but the unfolding of OM.
And whatever transcends the three realms of time,
that indeed is the flowering of OM.
This pure self and OM are as one,
and the different quarters of the self
correspond to OM and its sounds.
--Mandukya Upanishad

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You progress not through improving what has been done, but reaching toward what has yet to be done.
--Kahlil Gibran