The balanced rhythmic flow of poetry or oratory is referred to as

The balanced rythmic flow of poetry or oratory is referred to as cadence.

Cadence is the rise and fall of the voice that creates a melodic pattern when reading, or even when talking in general. Some languages have a cadence that is more pronounced than others, such as Italian.

A change in cadence can also influence the meaning of a sentence or word. For example, saying "He is a great person" can mean very different things depending on where the emphasis of the intonation is. If the cadence emphasizes "great" instead of "person", the sentence could have a sarcastic meaning.

the anecdote makes readers feel sorry for the man’s lack of heritage, then reminds readers that the man has an equally valuable heritage.