29 Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen.
12 For the word of God is living and active. Sharper than any double--edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.
18 But the things that come out of the mouth come from the heart, and these make a man 'unclean.' 19 For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, slander.
14 The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned.
20 From the fruit of his mouth a man's stomach is filled; with the harvest from his lips he is satisfied. 21 The tongue has the power of life and death, and those who love it will eat its fruit.
Evidence That Demands a Verdict: Life-Changing Truth for a Skeptical World - Josh and Sean McDowell
Little Pilgrim's Progress (Illustrated Edition) - Helen L. Taylor