“What we do on some great occasion will probably depend on what we already are; and what we are will be the result of previous years of self-discipline.”
– Henry Parry Liddon
I have seen this quote attributed to Vince Lombardi in a ton of publications. Regardless of who said it, it is so true. All of our successes or failures are a direct result of habits.
Almost everyone you meet who is successful or not successful, usually can link their results to self-discipline or lack of discipline over a long period of time.