Historical clue formulations

• "Just a heightened sense of awareness," per John Lennon — 2020-06-20
• "There is no literature and art without ___": Thomas Pynchon — 2019-01-11
• Irrational suspicion — 2018-05-29
• It's "knowing all the facts," according to Woody Allen — 2017-09-21
• Recurring theme in Philip K. Dick novels — 2017-03-05
• Theme of "The Tell-Tale Heart" — 2012-12-28
• "They're following me!" feeling — 2006-02-06
• Unsettling thought — 2005-04-14
• Fear — 1999-09-03
• Irrational distrust — 1996-03-28