Historical clue formulations

• "Have I ever steered you wrong?!" — 2020-09-24
• "I'm telling you the truth" — 2017-02-10
• "Honest" — 2014-08-02
• Words from a con man — 2012-05-20
• Words to a doubter — 2011-06-04
• Line from a scam artist — 2007-08-11
• Words to a skeptic — 2005-11-26
• "Would I lie?!" — 2003-12-14
• Con artist's words — 1995-02-03