Mental toughness and resilience fade if they aren’t used consistently. I say it all the time: you are either getting better, or you’re getting worse.… - David Goggins

Breaking the shackles and stretching beyond our own perceived limits takes hard fucking work — oftentimes physical work — and when you put yourself on the line, self doubt and pain will greet you with a stinging combination that will buckle your knees.

That's the beauty of discipline. It trumps everything. A lot of us are born with minimal talent, unhappy in our own skin and with the genetic makeup with which we were born. We have fucked-up parents, grow up bullied and abused, or are diagnosed with learning disabilities. We hate our hometown, our teachers, our families, and damn near everything about ourselves. We wish we could be born again as some other motherfucker in some other time and place. Well, I am proof that rebirth is possible through discipline, which is the only thing capable of altering your DNA. It is the skeleton key that can get you past all the gatekeepers and into each and every room you wish to enter. Even the ones built to keep you the fuck out! ...
Discipline builds mental endurance because when effort is your main priority, you stop looking for everything to be enjoyable. Our phones and social media have turned too many of us inside out with envy and greed as we get inundated with other people's success, their new cars and houses, big contracts, resort vacations, and romantic getaways. We see how much fun everyone else is having and feel like the world is passing us by, so we bitch about it and then wonder why we are not where we want to be.
When you become disciplined, you don't have time for that bullshit. p140

The hard part is getting to that point, because the ticket to victory often comes down to bringing your very best when you feel your worst.