Possible Clues:

• What 'strikes deep,' in Stephen Stills' 'For What It's Worth'
• 'There is no literature and art without ___': Thomas Pynchon
• Quietly a prince admits love, one sort of obsession
• Feeling of persecution
• Soldier number one has a psychological condition
• It's 'knowing all the facts,' according to Woody Allen
• Suspicious tendencies of soldier from number one academy
• Recurring theme in Philip K. Dick novels
• Mental disorder characterised by delusions of persecution
• Excessive fear