Do not seek revenge or bear a grudge against anyone among your people, but love your neighbor as yourself. I am the LORD.
The difference between these has been explained as follows:
Revenge-seeking:
You ask your co-worker for a dollar. He says no. One week later, your co-worker asks you for a dollar. You say, “Absolutely not!”
Grudge-bearing:
You ask your co-worker for a dollar. He says no. One week later, your co-worker asks you for a dollar. You say, “Absolutely! I’m not you.”