Possible Clues:

• How silly to get on an insect to such a pronounced extent
• Having the same vowel sounds
• A second young man takes heart for granted describing courage with carriage
• Like hiring and firing fool working with soldier?
• Corresponding in sound from donkey close to insect
• Having vowel rhyme
• Kind of rhyming, as 'kid set on insect'
• Donkey getting on with smaller animal making similar sounds
• Corresponding, so we hear, since child needs a good book?
• Having resemblance of sound