And as you wish that others would do to you, do so to them. (Luke 6:31)
So whatever you wish that others would do to you, do also to them, for this is the Law and the Prophets. (Matthew 7:12)It goes beyond just being nice to people because we would want other people to be nice to us. It really extends to giving grace to others, and forgiving them just as we have been forgiven by our Father in Heaven.
I feel that in order to do this properly, we have to grow personally in our understanding of what Christ accomplished on the Cross.
For one will scarcely die for a righteous person—though perhaps for a good person one would dare even to die— but God shows his love for us in that while we were still sinners, Christ died for us. (Romans 5:7-8)
For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. (Ephesians 2:8-9)Even though we were enemies of God once, because of the blood shed by Christ, we have been reconciled to the Father. Christ took us in one hand, and the Father in the other and reconciled us to each other. He cancelled out that death sentence we deserved because of our sins.
And you, who once were alienated and hostile in mind, doing evil deeds, he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him, if indeed you continue in the faith, stable and steadfast, not shifting from the hope of the gospel that you heard, which has been proclaimed in all creation under heaven, and of which I, Paul, became a minister. (Colossians 1:21-13)We should also extend grace to others, simply by forgiving them when they have wronged us.
And forgive us our debts, as we forgive our debtors. (Matthew 6:12, KJV)
Put on then, as God's chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. (Colossians 3:12-13)We have to remember that we didn't deserve God's grace. Just as we didn't deserve forgiveness from God, others may not deserve forgiveness from us, yet that doesn't matter. We are still commanded to forgive.
We see in Hebrews what happens when we fall short of grace:
See to it that no one fails to obtain the grace of God; that no “root of bitterness” springs up and causes trouble, and by it many become defiled (Hebrews 12:15)If we don't forgive others, we will fall short of God's grace. This causes bitterness and that doesn't hurt others, it only hurts us.
Always determine to show grace to others, don't hold grudges and always show forgiveness to others. Always remember that Christ gave us far more than we deserve, so we need to remember that when we feel that we are wronged by others. It is just one of the ways we can show others that we as Christians are different.