Historical clue formulations

• Motivate — 2018-07-30
• Motivate — 2015-09-07
• Give rise to — 2014-12-21
• Spark — 2014-08-07
• Draw a breath — 2013-12-03
• Give rise to — 2013-10-30
• Motivate — 2013-01-15
• Hearten — 2010-10-07
• Motivate — 2008-07-26
• Fill with confidence — 2004-09-28
• Prompt — 1999-08-14
• Fill with feeling — 1997-12-09
• Move to act — 1994-01-08