Much is said of light

Is it the Light, or the bright headlights of an oncoming train?

Much is said of light

Much is said of light,
where it can be found,
for those of us who seek,
and how we know for sure
if we've actually encountered
a candle in the window
or the headlights of an
oncoming train.

So much is said of Light,
outside our skin,
but how much
are we willing to share
from within?