Historical clue formulations

• Feel remorse about — 2026-02-03
• Wish one could take back — 2025-12-07
• Facepalm emotion — 2022-06-30
• "A man has cause for ___ only when he sows and no one reaps": Charles Goodyear — 2021-12-26
• Beat oneself up over, say — 2021-05-02
• Feel sorry about — 2019-09-03
• Rue — 2017-08-16
• Kick oneself over — 2010-05-23
• Lament — 2009-08-09
• Product of hindsight, sometimes — 2006-11-17
• "To ___ deeply is to live afresh": Thoreau — 2002-10-06
• Wish undone — 2002-04-23
• "That I have but one life to lose for my country," to Hale — 1999-10-19
• Rue — 1998-05-31
• Wish undone — 1998-01-16
• "What if" feeling — 1996-12-05
• Never forgive oneself — 1996-01-20