Proverbs 15:4 ... As a tree gives us fruit, healing words give us life. A wholesome tongue is a tree of life. But evil words crush the spirit.
Proverbs 15:4 AMP ... A gentle tongue with its healing power is a tree of life, but willful contrariness in it breaks down the spirit.
Proverbs 15:2 ... Wise people use knowledge when they speak.
Proverbs 16:23 ... The heart of the wise teaches his mouth and adds learning to his lips.
Proverbs 16:24 ... Pleasant words are like a honeycomb, sweet to the soul and health to the bones, making a person happy and healthy.
In Matthew 12:34-37, Jesus tells us that out of the abundance of the heart (the innermost being), the mouth speaks. A good man out of the good treasure of the heart brings forth good things ... and that an evil man out of the evil treasure of his heart brings forth evil things.
He goes on to say that even every idle word that men shall speak, they shall give account in the Day of Judgment. For by your words you shall be justified and by your words you shall be condemned.
Reverend Robert W. & Mary C. Butler