What is Guile and bitterness?

My Husband came to me and said "To have true Joy in Christ you have to have no guile." I am like, What do you mean hun? He said, "think about it, think of the people you know that are truly joyful in the Lord." I have been pondering on this for a couple of days. People with no guile, who eyes are truly pure with Christ love. The missionary in Thailand... He truly had the joy and love that Christ meant for us to have. To be guileless what do we have to do to be come guileless. I spoke to My friend about this she is too guileless and she said it was by the fruit of the spirit. I have pondered on this as well. I pose this question. Can you have pure joy from the Spirit that produces fruit, if you have guile in your heart? The answer is no. What is guile? you may ask well Websters dictionary says Guile means 1 : deceitful cunning and according to God's word KJV
Psa 34:13 Keep thy tongue from evil, and thy lips from speaking guile.
Psa 32:2 Blessed [is] the man unto whom the LORD imputeth not iniquity, and in whose spirit [there is] no guile.

So what does this mean exactly. How do you remove guile from your heart? Personally, I am aware I am not guileless. I think that Bitterness leads to having Guile. I am bitter. How do I remove bitterness?

Bitterness is a terrible disease. Yes I said disease. Think of a beautiful garden, with all these beautiful and nice smelling flowers. Well at first the garden is well taken care of and it's beautiful and bright. Everyone likes the garden and it seems that nothing can hurt or ruin the garden. Then someone comes along and walks through the garden not to watch for the flowers. Some of the garden dies due to carelessness. It no longer is strong enough to watch out for the roots. The the care taker sprays the wrong kind of bug killer on it, it weakens it more. Then a root begins in the very bottom of the soil. For dramatic reasons will say its dark and black waiting to choke out the goodness from the flowers. Like a cancer or black mold. Well at first no one can see the root no one can see the spreading of the cancer among the Flowers. It just creeps up. Then one day out of no where the cancer has killed all the beauty from the flowers. Have you ever seen a pretty weed. Well this weed on the outside seems harmless, but it really is choking the insides of the flowers. This is Bitterness. This is where guile comes from. God sent Jesus to earth after we have given our hearts to him, to heal the cancer that causes us so much pain. I have met people that have this joy that comes from being guileless. The only way to remove a weed really is to remove the seed. The bible speaks of people that God put the spirit of bitterness upon to complete certain task. So with that in mind... I think that my guile comes from my heart. I am just unsure how to remove the bitterness the weed not just the weed but is seed from my heart. People say to me think of the future the present not the past. But it seems uncontrollable, I can't seem to forget. I can pretend to. Like the pretty weed I can even put a smile on my face. The words and there actions are forever etched in my heart. The answer is in Jesus, only He can remove this seed of deceit and guile. Only Jesus can give this freedom, sometimes we have to learn lessons, or even be willing to give up what we hold on so tightly too.

Prayer
Dear Father, I know I am not perfect but I know I want you to remove the weed seed from my heart. So I can become Guileless and become fruitful for your kingdom. In Jesus Name Amen