How did Jean de La Fontaine use changing tones in his Fables?

Jean de La Fontaine achieved remarkable tonal diversity in his Fables through a combination of technical mastery and a highly personal narrative voice. His ability to shift tones—often swiftly and imperceptibly—is central to the work's enduring appeal.1

Mechanisms of Tonal Variation

La Fontaine utilized several methods to modulate the tone of his poetry:

• Narrative Voice: The poet’s own voice is constantly present, maintaining a controlled and discreet demeanor even when expressing deep emotion. His tone fluctuates between being ironical, impertinent, brusque, laconic, eloquent, compassionate, melancholy, or reflective.1
• Prosody and Rhythm: By employing lines of varying meter and an unpredictable interplay of rhymes and changing rhythms, he created diverse effects of movement and tone.1
• Vocabulary: He harmonized widely different linguistic elements, blending the archaic, the precious, and the burlesque with refined, familiar, and rustic language, as well as the specialized terminology of trades, philosophy, and mythology.1
• The Concept of Gaiety: The predominant note is la gaieté, which La Fontaine defined not as mere laughter, but as a "certain charm" that can be applied to any subject, including the most serious, to invite the reader into a complicit understanding of the human comedy.1