Angela Duckworth, in her book Grit: The Power of Passion and Perseverance , stated, "Grit specifies having a passion to accomplish a particular top-level goal and the perseverance to follow through. Enthusiasm is common. Endurance is rare" (Angela Duckworth, Grit: The Power of Passion and Perseverance , 2016, 250). Let me repeat the last part. "Enthusiasm is common. Endurance is rare." Angela Duckworth also wrote in the same book, "Grit grows as we figure out our life philosophy, learn to dust ourselves off after rejection and disappointment, and learn to tell the difference between low-level goals that should be abandoned quickly and higher-level goals that demand more tenacity" (Angela Duckworth, Grit: The Power of Passion and Perseverance , 2016, 86). Concerning those who fall short, John Greenleaf Whittier's words seem particularly fitting: "For of all sad words of tongue or pen, / The saddest are these: 'It might have been!'