Proverbs 13:17

20 A man’s belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled.
21 Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.

18 But those things which proceed out of the mouth come forth from the heart; and they defile the man.
19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:

Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O Lord, my strength, and my redeemer.

A fool uttereth all his mind: but a wise man keepeth it in till afterwards.

A word fitly spoken is like apples of gold in pictures of silver.