Classic Poem

In regard to Eternity (said the Old Mandarin)
I feel about it as I do about one of my teeth.
Every now and then it gives me
A devil of a twinge,
And for a while
I groan and can think of naught else.
Then the anguish abates and I dismiss it from my mind.
But I know, just the same,
That some day
I've got to go through with it.