A lying tongue hates those it hurts, and a flattering mouth works ruin. When God's wisdom is at work there is a sense of humility and submission. Worldly wisdom promotes envy and selfish ambitions, which seek control of the tongue through boasting. Humility and submission allows us to see the condition of our hearts and enables to control our tongue. In the meantime we can work on the attitudes of our hearts.
Wisdom understands using the tongue for boasting is evil.
Why, you do not even know what will happen tomorrow. You are a mist that appears for a little while and then vanishes. Instead, you ought to say, If it is the Lord s will, we will live and do this or that. As it is, you boast and brag. All such boasting is evil.