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Words have the power to change lives for the better or for the worst.
Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high; Hebrews 1:3
Colossians 2:2  That their hearts might be comforted, being knit together in love, and unto all riches of the full assurance of understanding, to the acknowledgement of the mystery of God, and of the Father, and of Christ;
3  In whom are hid all the treasures of wisdom and knowledge.
4  ¶And this I say, lest any man should beguile you with enticing words.

With the same tongue we can bless or we can curse.
Jam 3:10
Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
Doth a fountain send forth at the same place sweet [water] and bitter?
Can the fig tree, my brethren, bear olive berries? either a vine, figs? so [can] no fountain both yield salt water and fresh.

The Commandments of God show us the way to live a holy life by their words and the temptations of Satan lead to corruption by his words.
For if ye shall diligently keep all these commandments which I command you, to do them, to love the LORD your God, to walk in all his ways, and to cleave unto him; Deuteronomy 11:22
And he that keepeth his commandments dwelleth in him, and he in him. And hereby we know that he abideth in us, by the Spirit which he hath given us. 1 John 3:24

Pay heed to which voice you chose to follow, the Voice of The Lord or the voice of the evil one.
And he said unto them, Take heed what ye hear: with what measure ye mete, it shall be measured to you: and unto you that hear shall more be given. Mark 4:24
Psalms 95:7  ¶For he is our God; and we are the people of his pasture, and the sheep of his hand. To day if ye will hear his voice,
8  Harden not your heart, as in the provocation, and as in the day of temptation in the wilderness:
9  When your fathers tempted me, proved me, and saw my work.
10  Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways:

It is by words expressed in the thoughts of our hearts that we can lose our peace or gain it.
1 Chronicles 29:17  I know also, my God, that thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of mine heart I have willingly offered all these things: and now have I seen with joy thy people, which are present here, to offer willingly unto thee.
18  O LORD God of Abraham, Isaac, and of Israel, our fathers, keep this for ever in the imagination of the thoughts of the heart of thy people, and prepare their heart unto thee:
19  And give unto Solomon my son a perfect heart, to keep thy commandments, thy testimonies, and thy statutes, and to do all these things, and to build the palace, for the which I have made provision.

Good words incorporated into our lives have the power to transform our lives into Saints.
For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart. Hebrews 4:12

Evil words can corrupt the heart and transform a good person into an evil one.
Matthew 15:18  But those things which proceed out of the mouth come forth from the heart; and they defile the man.
19  For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
20  These are the things which defile a man: but to eat with unwashen hands defileth not a man.

The Word of God is a light that shines into the darkness illuminating the lives of many.
2Pe 1:19
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: