Historical clue formulations

• Promises — 2021-03-06
• Eases the misgivings of — 2011-09-25
• Warrants — 2006-05-19
• Bolsters the confidence of — 2000-08-31
• Guarantees — 1998-10-25
• Makes certain — 1997-07-01
• Informs positively — 1996-09-15