Isaiah 50:4 (NLT)
⁴ The Sovereign LORD has given me his words of wisdom, so that I know how to comfort the weary. Morning by morning he wakens me and opens my understanding to his will.

If you and I are going to have tongues that delight, rather than condenm, control, consume, corrupt and compromise ….then we must meet with the Lord each day and learn from Him. We must get our "spiritual roots" deep into His Word. We must pray and meditate and permit the Spirit of God to fill our hearts with God's love and truth.

Let me suggest that we start using the "Twelve Words That Can Transform Your Life." (Warren Wiersbe) If you use these words and sincerely mean what you say from your heart, you will find that God will use you to be a blessing and encouragement to others. There are only twelve of them, but they work.
"Please" and "Thank you." When you use these three words, you are treating others like people and not things. You are showing appreciation.
"I'm sorry." These two words have a way of breaking down walls and building bridges.
"I love you." Too many people read "romance" into these words, but they go much deeper man that. As Christians, we should love the brethren and even love our enemies. "I love you" is a statement that can carry tremendous power.
"I'm praying for you." And be sure that you are. When you talk to God about people, then you can talk to people about God. Of course, we never say "I'm praying for you" in a boastful way, as though we are more spiritual than others. We say it in an encouraging way, to let others know that we care enough for them to meet them at the throne of grace.

God can use our tongues to direct others into the way of life, and to delight them in the trials of life. The tongue is a little member, but it has great power.
Give God your tongue and your heart each day and ask Him to use you to be a blessing to others.