40% rule
In Can’t Hurt Me: Master Your Mind and Defy the Odds, David Goggins explains the 40% rule, which states that when people feel like they’ve reached their limits, they’re actually only 40% done, with the remaining 60% left in their tank.
when the mind signals fatigue, exhaustion, and the desire to quit, it’s merely scratching the surface, indicating that only 40% of one’s true potential has tapped.
// So basically we do have potential to overcome hard times or dark moments.