WHOSE SIN IS IN THE PERIPHERY?

In reality every person you know - every last person on this planet - is both a victim and a perpetrator of sin. The temptation, though, for every one of us is to play up instances of our victimhood while we downplay our own guilt in hurting others. We're always the ones getting our cheeks slapped, never the ones slapping the cheeks of others. Sometimes we focus on the wrong others do to such an extent that our own sinfulness disappears in the periphery.  It's a recipe for anger, self-righteousness and complaining. 

We would do well to practice the opposite: put our focus on recognizing our own sinful thoughts, words and actions while giving only a passing glance at the sins of others.

This is "removing the log from my own eye". 

This is Paul saying, in I Timothy 1:15, quite sincerely: "Here is a trustworthy saying that deserves full acceptance: Christ Jesus came into the world to save sinners - of whom I am the worst."