Words are powerful but the way they are delivered is even more powerful. I've frequently prayed the quick prayer of "Lord, keep one arm around my shoulders and your other hand near my mouth!"
In James 3:9 it says, "With the tongue we praise our Lord and Father, and with it we curse men, who have been made in God's likeness." I'm sure none of us would ever intentionally "curse" those we love. But when our words are laced with hatred, when we snap at those we love, are we not causing our words to have the same effect as a curse? All of the communications seminars in the world will not help us in our day to day lives until we strive to watch the way we use our tongues around those who mean the most to us.
This is an area that I feel constantly challeneged to work on - gaining control of the tongue!! If I can learn to speak lovingly to those whom I live with - which also makes them the ones most likely to catch me at my worst! - then I will have begun to, as James says, "able to keep the whole body in check (James 3:2)".
As you may have guessed, this is seriously relevant to where life is right now. I need to learn to slow down, think twice (or three or four times) before speaking and focus first and foremost on making sure that my words are laced with love and grace.