In your relationships with one another, have the same mindset as Christ Jesus. ~ Philippians 2:5
The bulk of the old testament teaches us how to be on good terms with God and love Him.
The new testament is dedicated to teaching us how to be on good terms with others and love them as Christ loves them.
Life is far to valuable to waste on anger or grudges held against someone. There is nothing "Christ-like" in living with a grudge. In fact, it does more harm to you than your target.
Perhaps today is the day you restore a few broken relationships.
Start by making a list of those people on your "grudge list". Pray for them every day for a week. Then reach out and work toward restoration or closure - God will lead the way.
GO DEEPER: Matthew 6: 7-15