When I was in elementary school in Canada, every morning we would recite the Lord’s Prayer. We were taught the words and spoke them by rote, but at the time, they didn’t hold much meaning for me. The Lord’s Prayer is actually a simple formula for prayer given by Jesus to his followers.
First, he has them pray for the coming of the kingdom of heaven, so that things will be done on earth as they are in the heavenly realm:
Thy kingdom come, Thy will be done in earth, as it is in heaven.
Next, he has them pray for the basic necessities of life: food, and forgiveness:
Give us this day our daily bread, and forgive us our transgressions, as we forgive those who have transgressed against us.
Finally, he tells his followers to ask for the strength to remain good despite temptation:
Lead us not into temptation, but deliver us from evil.
After giving them the formula, he further explains the concept of forgiveness:
If you forgive others for their transgressions, heaven will also forgive you. If you do not forgive others, neither will heaven forgive you.
One who cannot forgive actually poisons their own spirit, and cannot enter the kingdom of heaven.