JOHN VESPASIAN is the author of eighteen books, including “When everything fails, try this” (2009), “Rationality is the way to happiness” (2009), “The philosophy of builders” (2010), “The 10 principles of rational living” (2012), “Rational living, rational working” (2013), “Consistency: The key to permanent stress relief” (2014), “On becoming unbreakable” (2015), “Thriving in difficult times” (2016), “Causality: Aristotle’s life and ideas” (2024), “Foresight: Schopenhauer’s life and ideas” (2024), and "Constancy: Michel de Montaigne's life and ideas" (2025).