Final answer:
A suitable Herodotus quotation that links his narrative to McGonigal's claim is not explicitly provided. Instead, Herodotus's comparative cultural analysis implies his contemplation on the relativity of cultural practices, which align to McGonigal's notion of authors' viewpoints affecting their historical accounts.
Step-by-step explanation:
The quotation connecting Herodotus' narrative to McGonigal's claim pertains to the perspective and epistemological approach that these authors have towards the cultures they discuss. A specific quotation from Herodotus that could bridge this connection is not given in the provided information. However, Herodotus's assertion that, despite the perceived superiority of Greek civilization, other cultures, prominently the Persians, could be as complex and militarily powerful, reveals his comparative cultural analysis. This connects to the broader discourse on how authors' viewpoints influence their depiction of different societies, a relevance that suggests why certain voices may be perceived as more dependable or credible in historical narratives.
Herodotus's work, while it labels Persians as "barbarians", shows his attempt to grapple with the question of cultural relativity. This aspect resonates with McGonigal's claims about authors' bias and the understanding of other cultures, indicating the complexity of historical interpretations and the possible presence of subjective elements in historical accounts.