Wisdom of the ages

Each of you has a priceless
Jewel in your own body.
It radiates light through your eyes,
Shining through the
Mountains, river, and earth.
It radiates light through your ears,
Taking in all sounds, good and bad.
It radiates light through
Your six senses day and night.
This is also called absorption in light.
You yourself do not recognize it,
But is it in your physical body,
Supporting it inside and out,
Not letting it tip over.
Even if you are carrying
A double load of rocks
Over a single-log bridge,
It still doesn’t let you fall over.
What is it?
If you seek in the slightest,
It cannot be seen.

- Ta-an (d.883)