Believe it or not the above question has an incredibly simple answer, but the things you have to understand to grasp it are not so easy. Let us start with a question.
During the Sermon on the Mount the Lord Jesus gave us a model for prayer, it goes as follows.
“In this manner, therefore, pray: Our Father in heaven, Hallowed be Your name. Your kingdom come. Your will be done on earth as it is in heaven. Give us this day our daily bread. And forgive us our debts, as we forgive our debtors. And do not lead us into temptation, but deliver us from the evil one. For Yours is the kingdom and the power and the glory forever. Amen. For if you forgive men their trespasses, your heavenly Father will also forgive you. But if you do not forgive men their trespasses, neither will your Father forgive your trespasses.” Matthew 6:9-15.