You can hurt more than you ever thought possible, then continue until you discover that hurting isn't that big a deal.
Injuries are our best teachers.
Rational assessments too often led to rational surrenders.
It's a hard, simple calculus: Run until you can't run anymore. Then run some more. Find a new source of energy and will. Then run even faster.
Train at your current fitness level, or slightly above โ not where you want to be.
Only the most saintly and delusional among us welcomes all pain as challenge, perceives all loss as harsh blessing.