Jesus had a sobering response to the religious people of His day that were getting upset at the disciples for not observing their traditions of hand washings before meals.
Matthew 15;1-20
 Some Pharisees and teachers of religious law now arrived from Jerusalem to see Jesus. They asked him, “Why do your disciples disobey our age-old tradition? For they ignore our tradition of ceremonial hand washing before they eat.”
 Jesus replied, “And why do you, by your traditions, violate the direct commandments of God?  For instance, God says, ‘Honor your father and mother, and ‘Anyone who speaks disrespectfully of father or mother must be put to death.’ But you say it is all right for people to say to their parents, ‘Sorry, I can’t help you. For I have vowed to give to God what I would have given to you.’  In this way, you say they don’t need to honor their parents. And so you cancel the word of God for the sake of your own tradition. You hypocrites! Isaiah was right when he prophesied about you, for he wrote,These people honor me with their lips,but their hearts are far from me.
Their worship is a farce,for they teach man-made ideas as commands from God.
Then Jesus called to the crowd to come and hear. “Listen,” he said, “and try to understand. It’s not what goes into your mouth that defiles you; you are defiled by the words that come out of your mouth.”
Then the disciples came to him and asked, “Do you realize you offended the Pharisees by what you just said?”
Jesus replied, “Every plant not planted by my heavenly Father will be uprooted, so ignore them. They are blind guides leading the blind, and if one blind person guides another, they will both fall into a ditch.”
Then Peter said to Jesus, “Explain to us the parable that says people aren’t defiled by what they eat.”
“Don’t you understand yet?” Jesus asked.  “Anything you eat passes through the stomach and then goes into the sewer. But the words you speak come from the heart—that’s what defiles you. For from the heart come evil thoughts, murder, adultery, all sexual immorality, theft, lying, and slander. These are what defile you. Eating with unwashed hands will never defile you.”

It is interesting to see that Jesus revealed the reason their hearts were distant from God, though they acted so self-righteous,
like they had had favor with God regardless of the evil in their hearts. It was the way they spoke and lived that kept them distant from God. The thoughts of the heart came forth in their speech, resulting in defilement in their character.
      When I was eight years old, I lost my mom to cancer. In the few short weeks that followed I was living far from my home near Chicago, with one of my sisters where I had to get accustomed to a new school. It was great that I had family that loved me, yet my heart began to react to the loss that I had suffered. For reasons not known to me at the time, I began cursing and remember especially, saying God's name in vain as an everday occurence. I do recall the wierdness I felt as I heard those words come out of my mouth. I suppose it was the awkwardness of my feelings of loss and possibly anger that I was not sure how to deal with as a young child that had lost his mother.
When people curse and use God's name in vain, their is probably a reason the heart has submitted to that type of behavior.
Perhaps it is a deep wound that you have pushed under the rug, only to realize it has popped back out in the form of evil speaking.
 Exodus 20:7
"You shall not take the name of the LORD your God in vain, for the LORD will not leave him unpunished who takes His name in vain."
This a very serious verse that shows us all our need for forgiveness. God is holy and does not take it lightly when we utter His name  as a curse word. When we hear His name used in this way, we can be sure their is a cause behind the evil that can be overcome by Salvation in the Lord Jesus Christ.
I believe that the Lord has shown us that the evil that comes out of our hearts in anger or frustration  has the ability to keep our hearts
distant and separated from God. That is not His will for us.
James 4:7-8
"Submit therefore to God.Resist the devil and he will flee from you.
Draw near to God and He will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded."
 I believe cursing can give birth to deception, and has the power to delude our outlook on the reason God gave us a voice.
We were made to worship our Creator, not to curse him.
He takes pleasure in the one that will keep their heart close to Him by honoring Him with their lips... and their lives.