Related Clues:

• Strong insistence
• Statement coming in a sort of letter read out
• Open admission
• Rule first cells must be set up for admission
• "That's well within my abilities!"
• 'That's well within my abilities'
• "That's well within my abilities"
• Heartfelt assertion
• Confident shout from an optimist
• Confidence-building mantra
• Acknowledgement of a certain type of letter, we hear
• Statement that sounds like you perhaps
• Assertion from one kind of character heard, found in either part of Twelfth Night
• Audibly, what could be you or I making assertion
• Any of five letters read out is a confession