Possible Clues:

• It is sprightly? The very thing!
• End of an FDR saying
• Third-person reflexive pronoun
• Part 3 of quote
• "... we have to fear is fear ___" (F.D.R.)
• Helping of trifle stingy? Sending it back is emphatically the thing
• "... nothing to fear but fear __"
• '...nothing to fear but fear ___'
• Middle-earth's Galadriel, perhaps -- the one and only?
• In and of --