God used His voice to speak the world into existence. We are created in His image. We are creative and we use the same technology He did; our voices, to create. Yes, voices create so you gotta watch it. What you talk about comes about.
Voices are flexible and we must operate with intentional selectivity as we (and others) become what we speak. Voices influence. Voices create success, fear, devotion, divorce, endurance, quitting, love, hate, opportunity, pessimism, development, retardation, inspiration, ruin, hope, and imagination.
God urges us to guard our tongues for if used unwisely they can burn down a third grader or an entire society. Used faithfully, they can build a great empire of believers. For a long time (even after conversion) I didn't get the big deal about how we are to speak. Didn't we each just talk? But I now see one's speech is a theme to one's life.
Voices are remarkably important; they are a God-thing. Say things with life intended. Ears which hear will form according to the construction of your sentences.