Beginnings, Endings

Flann O'Brien (and why did he shift the a in Brian to an e for his pseudonym? Will the answer ever be arrived at?), in At Swim-Two-Birds: 'One beginning and one ending for a book was a thing I did not agree with. A good book may have three openings entirely dissimilar and inter-related only in the prescience of the author, or for that matter one hundred times as many endings. [9]' Wait, now. Might we shift the may to must, here? We might; we may.