In so many ways, that was a small decision—involving one of several thousand Sundays in my life. In theory, surely I could have crossed over the line just that one time and then not done it again. But looking back on it, I realize that resisting the temptation of "in this one extenuating circumstance, just this once, it's okay" has proved to be one of the most important decisions of my life. Why? Because life is just one unending stream of extenuating circumstances. Had I crossed the line that one time, I would have done it over and over and over in the years that followed.
Focusing on one or more of your weaknesses. Every year, candidates seem to battle insecurities over the same issues: their GPA was only a ; their GMAT is just a fraction too low; they don’t have many significant extracurricalrs. It’s possible that those issues need to be addressed in your application, but this essay is absolutely not the place to do it. HBS will never admit you for mitigating every possible weakness; they will only admit you for showing remarkable strength in one or two really interesting areas. Take this essay as the opportunity to demonstrate the latter, and leave addressing your GPA or extracurriculars for other parts of your application.