Often times we forget that it our duty to forgive and forget those you wrong us or offend us and when the Holy spirit does not dwell in us we find it very difficult to let go. When we don't practice the love that Jesus showed when he was on earth that is the love of forgiving and forgetting continuously.
From the bible , a murderer is not only one who killed someone it can as well be someone who hates his brother meaning that God is encouraging us to love our brother continuously as a day commit to God and ourselves. That's why Satan will always fight for brothers to hate themselves so that they will not inherit the eternal life and thereby inherit eternal condemnation.
When Bitterness, wrath, anger and clamour with malice are not put away , it means that God which is love does not dwell in you. I wonder how a christain wil operate on these things, no space for these because the love of God has occupied your heart so mo room for all those things.
Love is the root of them all. Where there is no love all these will fail that why the bible says never fails. When love is absence in the life of man he struggles in everything he does and if you notice one thing when there is no love peace is also absence too, that's is why is grater than everything one can imagined.
And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.
The summary of it all it that we should love at all time. God is love I can't say am a christain when I don't forget the evil that one did to me that means am ready for the eternal glory ahead and the blessing therefore.
God bless us a we love one another