Within light there is darkness

Within light there is darkness,
but do not try to understand that darkness.
Within darkness there is light,
but do not look for that light.
Light and darkness are a pair,
like the foot before and the foot behind in walking.
Each thing has its own intrinsic value
and is related to everything else in function and position.
Ordinary life fits the absolute as a box and its lid.
The absolute works together with the relative,
like two arrows meeting in mid-air.

~Shih-tou