Break-in-the-narrative is a device which, on the one hand, offers a
number of variants in deciphering the implication and, on the other,
is highly predictable. The problem of implication is, as it were, a crucial
one in stylistics. What is implied sometimes outweighs what is expressed.
In other stylistic devices the degree of implication is not so high as in
break-in-the narrative. A sudden break in the narrative will inevitably
focus the attention on what is left unsaid. Therefore the interrelation
between what is given and what is new becomes more significant, inasmuch
as the given is what is said and the new—what is left unsaid. There is a
phrase in colloquial English which has become very familiar:
"Good intentions but—"
The implication here is that nothing has come of what it was planned to