Bitterness is a tremendous problem. Top psychiatrists have examined this subject thoroughly and have identified bitterness as the number one emotional problem. Bitterness may be suppressed; its presence may be disguised, denied, and unrecognized when a person is doing well in other areas of his soul.
If we don't apply God's love in a relationship, we grieve the Holy Spirit. We may be justified in our differences with another person, yet we must love them with God's love. If we begin to criticize, judge, and sow discord against them, we will grieve the Holy Spirit in us.
The Holy Spirit sends the love of God through the heart into the five parts of the soul. Having the soul filled with the love of God is one of the most precious things that can happen in the life of the believer.
With God's Word and God's love, the soul has all it really needs. Roots of bitterness cannot spring up when the love and grace of God are allowed to fill the soul to overflowing. Instead of infecting others, we will see curses turned into blessings. The healing power of the Holy Spirit inspires tremendous edification. Ultimately, God's Kingdom is furthered as others draw near to receive redemption, restoration, rehabilitation, and reconciliation.