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Words have a huge impact on all our lives. I know people who have lived a life of damaging insecurity because words of judgment and failure were spoken to them on a regular basis. These people can only be healed through God's unconditional love. They have been wounded in their souls (their inner selves, their mind and emotions), a place to which only God has complete access. However, once they are wounded by the words of others it takes time to rise above the wrong image they have of themselves. This is why it's crucially important that we learn to use our words for blessing and building up others, not wounding and tearing others down. Like Ephesians 4:29 says "Let no unwholesome word proceed from your mouth, but only such a word that is good for edification according the need of the moment, so that it will give grace to those who hear."
As Christians we should not tell people something unless we want them to become what we're saying. Words create an image inside of us, Proverbs 23:7 says that "as a person thinks in his heart, so is he." Believing the best in people and speaking words that build them up is one way of loving them. Think of these words and then ponder about how they make you feel:
Ugly Stupid Failure Insignificant Hopeless Unworthy Clumsy
Do they make you feel uplifted, exuberant about life as though you can be a success at anything you attempt? I am sure they don't. Now consider words like:
Attractive Intelligent Blessed Creative Talented Hopeful Lovely
I am sure such words affect you in a much more positive way.
Finally, read and consider these scriptures in light of the power of words:
"Anxiety in a man's heart weighs it down, but an encouraging word makes it glad." -Proverbs 12:25
"Pleasant words are as honeycomb, sweet to the mind and healing to the body." -Proverbs 15:23
"Death and life are in the power of the tongue, and they who indulge in it shall eat the fruit of it (for death of life) -Proverbs 18:21
You can see why words are so important in the life of the person who genuinely desires to walk in love toward others.