Human listeners can perceive consonance in speech even without studying metrical treatises. When the beginning, middle, and ending of a passage fit together, its movement is pleasant to hear; an appropriately placed pause also prepares attention for what follows.
For example, three well-matched admonitory clauses may create an expectation. When the final clause arrives in a fitting form and completes the meaning, the rhetorical effect increases. This is a general sense of harmony and coherence.
Such natural perception should not, however, be equated with the compulsory technical rules of one nation’s poetry. Languages and literary traditions develop different sound habits.