I've blogged before about bitterness, and mention this subject again following some work recently in my rather overgrown back garden. I've been working hard with cutters, clippers and even power tools on the foliage, however it's only when you get down to the roots do you really know that you've dealt with the weeds.
So, getting to the root of the problem is important. Here are some words from Samuel Logan Brengle.
Good, but do you know that your heart is clean? Are all the roots of bitterness gone? Do you bear patiently the faults of others? Do you bear meekly, and with a forgiving spirit, the unkindness of others? Do you love God with all your heart and soul and mind, and your neighbour as yourself? Do you feel that all malice and pride, and jealousy and envy, and evil and filthy desire, and unholy ambition and unbelief, and all foolish things have been taken out of your heart, and that the Holy Spirit has His own way in you all the while? Remember that holiness has to do with the heart, and that, as Solomon says, 'Out of the heart are the issues of life.' It is at the heart that Jesus looks, and He says, 'Blessed are the pure in heart.' Now, if your heart is not clean, do not be afraid or ashamed to say so, but frankly tell your Heavenly Father the whole truth about the matter.
...and from Scripture...
Hebrews 12:14-5 (The Message)
Work at getting along with each other and with God. Otherwise you'll never get so much as a glimpse of God. Make sure no one gets left out of God's generosity. Keep a sharp eye out for weeds of bitter discontent. A thistle or two gone to seed can ruin a whole garden in no time.
Keep the gardening tools close at hand.