A fool's mouth is his ruin,
and his lips are a snare to his soul. ESV
In this book, there is a different path highlighted by the authors: Words can change our brain. We know that our brain generates the words, but the other way around is pretty interesting: what we say can damage the brain structures and generate unhappiness.
Solomon, in his proverbs, said the same thing: The mouths of fools are their ruin;
they trap themselves with their lips. NLT
What is said may end up with joy. What is said damages life; damages the soul.
We need to say more positive words for the brain to change its connections. We have to alter the way we see the world and start saying words of life, words of encouragement, joy, contentment, positivity.
Our thoughts are powerful. What we allow to stay in our mind will damage our internal and external relationships. Internal because we get sick, and external because we can lose the chance of healthy relationships.
So we need to pray as the psalmist in Psalms 141:3
Set a guard, O LORD, over my mouth; keep watch over the door of my lips!"
Again and again, the Bible is right. Whoever meditates in it has more opportunity to experience the best of life, even in the midst of crisis and struggles.