Forgiveness is everything in an intimate relationship. We can have a relationship with God because Jesus paid the penalty for our sin so He could forgive us.
Colossians 2:13 When you were dead in your transgressions and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our transgressions,
In every human relationship forgiveness is the only way to have a close, intimate, and growing relationship.
1 Corinthians 13:4-5 Love is patient, love is kind and is not jealous; love does not brag and is not arrogant, does not act unbecomingly; it does not seek its own, is not provoked, does not take into account a wrong suffered,
When I say “I love you” to someone, I am not saying that I like them; I am not saying it as an expression of affection; I am saying it as a commitment, a particular promise that I intend to keep. When I say “I love you,” I am saying I will not take into account any wrong that you do to me no matter how bad it is and no matter how many times you do it, I am committing to you that I will forgive you of any sin you commit against me, no matter how bad it is, because God has forgiven me of every sin I have ever done. With that kind of love, any relationship will be strong and grow stronger.
Every morning I pray a prayer of commitment to the Lord. In the prayer I make about a dozen promises to God, one of the commitments that I make is “I will forgive anybody of anything, no matter how bad it is, no matter how many times they have done it, not because they deserve it but because God has forgiven me of every sin I have ever committed against Him.” At the end of my prayer I say, “Lord, I can’t keep these commitments in my own strength, would You give me the strength and the discipline to keep these for your glory.
If I don’t forgive others of their sins, God will not forgive me.
Matthew 6:14-15 For if you forgive others for their transgressions, your heavenly Father will also forgive you. But if you do not forgive others, then your Father will not forgive your transgressions.