1 Blessed is the one whose transgression is forgiven,
whose sin is covered.
2 Blessed is the man against whom the LORD counts no iniquity...
The words above are quoted by Paul in Romans 4.7-8. The second line of this Psalm, "Blessed is the man against whom the Lord counts no iniquity," is a great statement not only describing the grace of God toward us, but also a great example of the second promise we make, when we forgive another.
When we forgive others sins against us, Ken Sande reminds us that we make four promises. The first promise is that we will not dwell on the sin committed against us. This promise is beneficial for the relationship being repaired and for our own heart, so that bitterness will not grow.
When we forgive another's sins, the temptation will be to bring up the sin in a future time and use it to tear the other person down, either in person, or in gossip. To fight against this temptation, we remember how God forgives us. God will not count our sins against us (Psalm 32.2/Romans 4.8). God does not bring up our sins and use them against us. Our sins are perfectly paid for by the life, death, and resurrection of Jesus.
How do we keep this promise? We remember. We remember how God forgives us, and then we extend that forgiveness to others, when they sin against us.