Proverbs 10:32.
"The lips of the righteous know what is acceptable, but the mouth of the wicked speaketh frowardness" (being head strong, with stubbornness, self will). The righteous shows kind consideration. He knows what is acceptable because he has studied the other person and knows something of their state. He considers how difficult words would affect him. The wicked also knows the other person but speaks away from the appropriate answer. The wicked could care less about the other, thus he shows hurtful consideration, the desire to oppose.
Verse 11 says, "The mouth of a righteous man is a well of life, but violence covereth the mouth of the wicked". We know a well is an opening from which something must be drawn out. The good is inside the righteous and must be drawn out. He is not quick with his answer. But the answers are healthful, as water is healthful. If there is any healthful thing with the wicked it is inaccessible because the well is covered. What is obvious to all is the violence that covers his mouth. It is always on top, always presenting to people.
Lord help me - - give me the grace to be a healthful speaker. Please do not let me do damage and violence with my mouth. Give me the grace to be helpful.