For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart. (Heb 4:12 NKJ)

A cutting word is worse than a bowstring, a cut may heal, but the cut of the tongue does not. – African proverb.

“The tongue has no bones, but is strong enough to break a heart. So be careful with your words.” -Unknown

“All I need is a sheet of paper and something to write with, and then I can turn the world upside down.” -Friedrich Nietzsche

“Don’t mix bad words with your bad mood. You’ll have many opportunities to change a mood, but you’ll never get the opportunity to replace the words you spoke.” -Unknown

Several great quotes and all true—words are powerful.  Not just the spoken word, such as JFK’s speech in Berlin, or MLK’s speech in DC, but written words.  Poems have melted minds; love letters have melted heart and manifestoes have changed the world, for good or bad.

The Word of God, however, carries a health warning.  When it is used correctly, it can be like a surgeons scalpel.  It can cut out that cancer, remove that tumor or mend a break.  Used wrong and it can murder, kill and maim. Why, because there is nothing sharper, it can cut right down to the very essence of life, the marrow.  It can also cut in the realm of the psyche.

A word of warning to the user.  Be careful; it cuts both ways.