Proverbs 15:26
The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
Psalm 19:14
Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength, and my redeemer.
Psalm 37:30-31
The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.
Psalm 45:1
To the chief Musician upon Shoshannim, for the sons of Korah, Maschil, A Song of loves. My heart is inditing a good matter: I speak of the things which I have made concerning the king: my tongue is the pen of a ready writer.
Proverbs 6:16-19
These six things doth the LORD hate: yes, seven are an abomination to him:
Proverbs 15:23
A man hath joy by the answer of his mouth: and a word spoken in due season, how good it is!
Proverbs 24:9
The thought of foolishness is sin: and the scorner is an abomination to men.
Jeremiah 4:14
O Jerusalem, wash thy heart from wickedness, that thou mayest be saved. How long shall thy vain thoughts lodge within thee?
Matthew 12:34-37
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart, the mouth speaketh.
Matthew 15:19
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: