God says, "I have put my words in your mouth" (Isaiah 51:16).
His words, from the Bible, when spoken by us, carry His power and purpose into the physical and spirit world, as we may be under His anointing. When we speak God's words, they carry that same creative power as when He first spoke them.
The English word "word" is also translated from the Greek word rhema. This means words from God, from the Bible, that carry His special anointing and revelation for a specific person or situation. For example, a person can read a certain passage from the Bible many times and it may mean nothing to him. You can mechanically read the logos, as do many skeptics and doubters. But on another day, you may read the same passage again and all of a sudden a light comes on in your mind. Your spirit leaps. The passage suddenly has meaning, and it jumps out at you like it was ablaze with neon lights. You have received a revelation from God. You have received a rhema word.
A good example of the power of the rhema word is some years ago I was suffering from chronic, painful lower back pain. I knew what God said in His Word about healing, and one day I decided because of God's Word I didn't have to take the pain any more. I decided to take my Bible and go upstairs to my bedroom, lock the door, and not come out until I got my healing. I was totally determined and was confident of both God's power and willingness to heal me. After being locked in the bedroom for an hour or so and reading the Bible, all of a sudden my eyes fell on a verse I had read many times before, but it never held any significance for me. But this time, it was as though the words were illuminated, not literally, but they just jumped out at me. They were from Hebrews 12:13: "And make straight paths for your feet, lest that which is lame be turned out of the way; but let it rather be healed." Even if out of context, God had sent me a rhema word, and suddenly my back pain was totally gone! I had received my healing, via the power of a word from God. Sometimes rhema words come out of the biblical context, but they are still His words of power. It is important that we be open to them.
Another dramatic example happened over ten years ago when I began to have irregular heartbeats. This went on for several weeks and I became quite concerned. But I never went to the doctor because I was trusting God to take care of it. One day at a large church I was visiting, the congregation was singing and the words of the song were projected upon the front wall. The song included a Scripture, from Psalm 73:26: "God is the strength of my heart." Now I had read that Scripture before. I liked it, but it never meant anything personal to me. But on that particular day in that particular church, God spoke to me. Those words, "God is the strength of my heart" were a rhema word to me from God. The symptoms suddenly disappeared during that service and never returned!
True to His nature, God's purpose in the world is to bring life. Jesus was the exact representation of God (Hebrews 1:3), and He only did the Fathe's will. He said,
The thief (Satan) comes only to steal and kill and destroy; I have come that they may have life, and have it to the full (John 10:10, KJV).
He also said:
The words I have spoken to you are spirit and they are life (John 6:63).
When we speak the life-giving words of God from the Scriptures, we also impart life to people. Or if we speak words from Satan (words that are contrary to God's words), we impart death, or harm, to people.
Death and life are in the power of the tongue, And those who love it will eat its fruit (Proverbs 18:21).
God is saying that you will eat the fruit of whatever you say! That is a sobering reminder of the power of our words, for positive or negative, for life or for death.
With the tongue we praise our Lord and Father, and with it we curse men, who have been made in God's likeness. Out of the same mouth come praise and cursing (James 3:9-10).