If you can't say something nice, don't say anything at all.
That's an over simplification of a very huge precept mentioned often in the Bible.
Based on the end of the post from last night, which was the conclusion and realization that The Word is actually an integral part of the very nature of God, it's no wonder it holds such weight.
1 Peter 3:10/
For, “Whoever would love life and see good days must keep their tongue from evil and their lips from deceitful speech.
Colossians 4:6/
Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.
Ephesians 4:29/
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.
Proverbs 15:4/
The soothing tongue is a tree of life, but a perverse tongue crushes the spirit.
Matthew15:11
What goes into someone’s mouth does not defile them, but what comes out of their mouth that is what defiles them.
Proverbs 21:23/
Those who guard their mouths and their tongues keep themselves from calamity.
Psalms 34:13/
keep your tongue from evil and your lips from telling lies.
Titus 3:1-2/
Remind the people to be subject to rulers and authorities, to be obedient, to be ready to do whatever is good,
to slander no one, to be peaceable and considerate, and always to be gentle toward everyone.
Proverbs 12:18&19/
The words of the reckless pierce like swords, but the tongue of the wise brings healing.
Truthful lips endure forever, but a lying tongue lasts only a moment.