There is a direct link between speech and life-outcomes. Careless, unguarded talk creates exposure to enemies, conflict, and destruction. Keeping the mouth — disciplining what we say — is a life-protecting practice. The 'opening wide' of the lips pictures reckless, unfiltered speech that cannot be taken back.
Memory phrase: Guard your mouth always.
Talk about it: Has something you said ever caused big trouble? What happened?
Prayer: God, guard my mouth and my life.