There will always those who remember the evil things you done. You know the people every time someone says some nice about you. They come back with the statement, "I remember when they use to do this or that." Or every time you are trying give someone some advice about something. They come back with the statement, "How can they give someone any advice because I remember when they use to _________?"
The enemy strategically places these individuals in your path to keep you discouraged. The people in of themselves may even be Christians, but Satan can transform into an angel of light. In other words anyone can be use by Satan. For example, the Apostle Peter was use by Satan and Jesus rebuked him. We also know that God the Father reveal the true identity of Jesus the Christ to the Apostle Peter.
The I remember when folks are there for a purpose! The key is how you respond to those individuals. The Bible says in 2 Corinthians 5:17, If any man be in Christ Jesus he is a new creation, behold old things has passed away, and all things have become new!
Finally, don't let the I remember when folks keep you from bearing fruit for the glory of God! Paul said in Philippians 3:13-14, "but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, I press toward the mark for the prize of the high calling of God in Christ Jesus.