A well-arranged initial clause can create a natural expectation in the listener. When the next clause answers that expectation and completes the sense with compatible sound, the force of the discourse can increase.
The effect is not achieved by repetition alone. An ill-placed echo, a confused meaning, or a strained phrase created merely to maintain rhyme does not produce good eloquence. Sound and sense must work together.
This principle helps with Qur’anic verse endings: the final word cannot be assessed only by its phonetic likeness to neighbouring endings. Its semantic place in the larger address also matters.