Don’t be in any rush to become a teacher, my friends. Teaching is highly responsible work. Teachers are held to the strictest standards. And none of us is perfectly qualified. We get it wrong nearly every time we open our mouths. If you could find someone whose speech was perfectly true, you’d have a perfect person, in perfect control of life.

A bit in the mouth of a horse controls the whole horse. A small rudder on a huge ship in the hands of a skilled captain sets a course in the face of the strongest winds. A word out of your mouth may seem of no account, but it can accomplish nearly anything–or destroy it! It only takes a spark, remember, to set off a forest fire. A careless or wrongly placed word out of your mouth can do that. By our speech we can ruin the world, turn harmony to chaos, throw mud on a reputation, send the whole world up in smoke and go up in smoke with it, smoke right from the pit of hell. 

This is scary: You can tame a tiger, but you can’t tame a tongue–it’s never been done. The tongue runs wild, a wanton killer. With our tongues we bless God our Father; with the same tongues we curse the very men and women he made in his image. Curses and blessings out of the same mouth! 
–james 3:1-10 (msg)
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wow.  how disgustingly true.

take my life and let it be  consecrated, Lord, for Thee;
take my moments and my days, let them flow in ceaseless praise.
take my hands and let them move at the  impulse of Thy love,
take my feet and let them be swift and beautiful for Thee;
take my voice and let me sing always, only, for my King,
take my lips and let them be filled with messages from Thee;
take my silver and my gold, not a mite would I withhold,
take my intellect and use every power  as You choose.