The title piece of William Stafford’s “New and Selected Poems” is “The Way It Is”:

There is a thread you follow.  It goes among
things that change.  But it doesn’t change.
People wonder about what you are pursuing.
You have to explain about the thread.
But it is hard for others to see.
While you hold it you can’t get lost.
Tragedies happen; people get hurt
or die; and you suffer and get old.
Nothing you do can stop time’s unfolding.
You don’t ever let go of the thread.

thread is, for me, the love of God made real in the love of others.  It
can feel like a slender thread, sometimes, but it is stronger than
anything else.