I needed to be reminded. And this morning, when I opened up Anam Cara by John O'Donohue, I was.
The poem he quotes is by a Welsh poet, R. S. Thomas.

The Bright Field
R.S Thomas

I have seen the light break through
to illuminate a small field
for a while and gone my way
and forgotten it. But that was the pearl
of great prize, the one field that had
the treasure in it. I realize now
that I must give all that I have 
to possess it. Life is not hurrying
on to a receding future nor hankering after
an imagined past. It is the turning
aside like Moses to the miracle 
of the lit bush. To a 
brightness that seems as
transitory as your youth
once but is that eternity that awaits you.

Life is not hurrying on to a receding future nor hankering after an imagined past. That. 
It is the turning aside like Moses to the miracle of the lit bush. 
Yes, that.