Proverbs 16:23
A wise person's heart makes his speech wise and it adds persuasiveness to his words.
Proverbs 15:28
The heart of the righteous considers how to answer, but the mouth of the wicked pours out evil things.
Psalm 37:30-31
The godly speak wise words and promote justice.
Psalm 45:1
For the music director; according to the tune of "Lilies;" by the Korahites, a well-written poem, a love song. My heart is stirred by a beautiful song. I say, "I have composed this special song for the king; my tongue is as skilled as the stylus of an experienced scribe."
Proverbs 22:17-18
Incline your ear and listen to the words of the wise, and apply your heart to my instruction.
Matthew 12:34-35
Offspring of vipers! How are you able to say anything good, since you are evil? For the mouth speaks from what fills the heart.
Colossians 3:16
Let the word of Christ dwell in you richly, teaching and exhorting one another with all wisdom, singing psalms, hymns, and spiritual songs, all with grace in your hearts to God.