2 Corinthians 2:10-11

To whom ye forgive any thing, I forgive also: for if I forgave any thing, to whom I forgave it, for your sakes forgave I it in the person of Christ; Lest Satan should get an advantage on us: for we are not ignorant of his devices.

Forgiveness goes beyond any offense done to us but encompasses our own forgiveness from Jesus. We all walk together in this world and face the same mistakes.  The point is that we don’t harbor a grudge for something we could be judged for ourselves. If the devil can lead us into offense and unforgiveness, he would gain a foothold into our lives.  We were never created to let the devil win.