We have read your confession with thankfulness for your honesty and humility before the Lord. Your desire to be finished with sin and to press the button that would delete all future stumbling is a sign that God is at work in you, and your willingness to name your sin plainly, especially sins of the tongue spoken in anger and pride, is the very path Scripture points to for mercy.
The Lord has promised that if we confess our sins he is faithful and just to forgive us and to cleanse us from all unrighteousness, and that whoever confesses and forsakes sin will find mercy. He invites his people who are called by his name to humble themselves and pray and seek his face and turn from their ways, and he promises to hear from heaven and forgive. He is gracious and compassionate, slow to anger, quick to listen, and he gives mercy and grace to help in time of need.
You have rightly seen that power is perfected in weakness. When you boast not in your own strength but in your weakness, the power of Christ rests upon you. What is impossible with man is possible with God. No person can tame the tongue on his own, yet by faith those who were weak were made strong. God gave us the mouth and tongue not to tear down but to give thanks to him and to build up our neighbor. When we use our members as instruments of righteousness, our tongue imitates the tongue of Christ, speaking words full of gentleness and meekness, speaking for our neighbor's good and not merely to vent our own hurt or anger. The remedy you have named is true, to put a bridle on the tongue, to be quick to listen, slow to speak, slow to become angry, and to speak only what is helpful for building others up.
This is why lowliness and meekness and long suffering are so needed. A person can be lowly in words for a moment and yet be quick and irritable, and then all is lost. The Holy Spirit does not dwell where wrath remains. Whether we pray or speak or keep silent, anger ruins all. Therefore cast off unseasonable reproaches and disorderly desires, and learn the gentleness of Christ who when reviled did not revile in return but answered, I have not a devil, and if I have spoken evil bear witness of the evil. He who brings out the precious from the vile shall be as the mouth of God.
Your confession that you have been a person of unclean lips and that your sins testify against you is honest, and God meets such honesty with discipline that is not unto death but unto training. Though discipline is not pleasant at the present but grievous, afterward it yields the peaceful fruit of righteousness to those who have been trained by it. Even Christ, the author and pioneer of our salvation, was perfected through suffering and learned obedience, that he might become the source of salvation. Your trials, when received with patience, work perseverance and proven character and a hope that does not disappoint, because the Holy Spirit has been poured out.
So continue in the remedy God has given. Confess your sins to one another and pray for one another that you may be healed, for the prayer of a righteous person is powerful and effective. Abide in Christ and in his words, for apart from him we can do nothing, but in him we can walk as he walked. Renew your mind, take words with you and return to the Lord and say, take away all iniquity and receive us graciously.
We pray for you now. Father, in the name of Jesus Christ, the one mediator between God and man and the only name under heaven by which we must be saved, hear this your servant who has humbled himself and confessed. Forgive and cleanse according to your promise in Christ, grant grace to forsake what has been confessed, set a guard over his lips, teach him to speak words that are gracious and comforting and that build up, make his weakness the place where your strength is displayed, and bring forth in him a harvest of righteousness and peace and a quiet confidence that remains. Keep him abiding in your Son, growing in love from a pure heart and a good conscience and a sincere faith, until he is made complete. Amen.