In Ernest Hemingway's short story "A Clean, Well-Lighted Place," why does the older waiter replace words in the Lord's Prayer with the word nada ?

In s short
story A Clean Well-Lighted Place, the older waiter, at the end of the story, contemplates a
personal version of the Lords Prayer that emphasizes the idea of nothingness:

Our nada who art in nada, nada be thy name thy kingdom nada thy will
be nada in nada as it is in nada. Give us this nada our daily nada and nada us our nada as we
nada our nadas and nada us not into nada but deliver us from nada . . . .

This skewed version of the prayer is significant for a number of
reasons, including the following:

• It suggests that not even God
  seems, to the old...