Discipline in my opinion is simple, just focus, make rules and just do it and repeat the process (focus, make rules n and just do it and repeat until you get used to it) if you don't focus, you will definitely stray somewhere, if you don't make rules, you will be careless and if you don't don't just do it, it's definitely just lips and no action. If it's not repeated, humans like to forget and certainly can't be disciplined.