Mental toughness isn't about forcing a perfect plan. It's about being adaptable. When you're low on time or energy, do a shorter or easier version of your habit. This "bend but don't break" approach prevents you from quitting altogether, making you more resilient and consistent long-term.

The cultural mantra that “winners never quit” is a direct path to burnout. Instead of defaulting to perseverance, high achievers should treat it as a conscious choice. This allows for strategically quitting draining endeavors to reserve energy for what truly matters, ultimately preventing exhaustion and making success more sustainable.

A decade after publishing "Grit," Angela Duckworth has revised her thinking. She now fears that teaching to "grind for the sake of perseverance" leads to burnout. True, sustainable high performance comes from a genuine passion for the craft, which makes the required hard work feel natural.

While perseverance is crucial, focusing solely on "grinding" is a mistake. Angela Duckworth, author of *Grit*, regrets not balancing her message with the importance of passion. The ability to persevere in a field you don't love is a direct path to burnout.

The key skill for navigating a varied career isn't just persistence. It's the agility to see a goal clearly and creatively find different paths to achieve it, rather than rigidly sticking to one approach that isn't working.

High achievers' passion is defined by endurance and loyalty to a long-term goal, not by intense bursts of manic energy or enthusiasm. This redefines passion as a measure of consistency over time, highlighting that while excitement is common, endurance is rare and more valuable.

Our culture glorifies persistence, but knowing when to disengage from an unattainable goal is an equally important skill. People adept at letting go when a goal is no longer feasible experience better mental well-being and are able to re-engage with new goals more quickly.

High achievers exhibit grit not by being rigid, but by maintaining an unwavering commitment to a top-level goal while being highly adaptive with their lower-level tasks and to-do lists. This allows them to respond to changing circumstances and new tools like AI without losing direction.

Bill Gurley highlights that Angela Duckworth, author of "Grit," has revised her thinking to emphasize passion over perseverance. Forcing yourself to "grind" through a subject you don't care about is draining and unsustainable. In contrast, pursuing a fascination is energizing and creates a self-perpetuating learning cycle.