God's word causes/makes all contrary things come in line with it. You see that in Genesis 1 when there was darkness God said, "Light be" and there was light. Everything God released his word to do everything that was contrary with it came in line with it. And when God authorizes you to speak something and you speak it beleiving then everything will line up with it. God told Abram that he would make him a father of many nations, but notice his body was dead and his wife's womb was dead (Romans 4:19). So, what did God do he changed their names to Abraham(father of a multitude) and Sarah(Princess of nations). Notice, their names were changed to match what God said he would do. And their bodies lined up with it. Abraham was not weak in faith, but was strong in faith (Romans 4:19,20).
Look at Jesus, he only spoke the word of God and when he released it believing all contrary conditions lined up with it. When a man couldn't walk Jesus would tell him, "Rise, take up thy bed, and go thy way into thine house" and they did. A man with a withered hand and Jesus told him, "Stretch forth thine hand" and he did. When a woman was barren God would send her a word that she would have a child and they did. God said that a virgin shall conceive and bring forth a son and she did. All conditions give way to the word of God. And you have been authorized to speak God's word because the scripture says, "Let us hold fast the profession(confession) of our faith."
James 3 is an excellent chapter that shows you the effect your words have on your body. Verses 3 and 4 says, "Behold, we put bits in the horses' mouths, that they may obey us; and we turn about their whole body." "Behold also the ships, which though they be so great, and are driven of fierce winds, yet are they turned about with a very small helm, whithersoever the govenor listeth." What are these verses saying, in verse 4 the tongue of the horse is used to control the body, he's showing you the comparison with your tongue. In verse 5 he's saying you(spirit you) are the governor, your body is the ship because it's how you get around in this physical world. And the rudder is the tongue. So, if you want to turn your ship change your words. And did you notice that no matter how fierce the winds are the ship goes where you guide it.
Isn't that what Abraham and Sarah did when God changed their names. Notice, God gives you something to say to change your body. Why, because Romans 1:16 says that the word of God is the power of God. So, if you hold fast to your confession of faith the power of God will turn your body. In Proverbs 4: 20-22 it instructs you to keep the word in your eyes, ears, and mouth for it is health to your flesh. That word health is translated as medicine, healing, remedy, and cure. The words you speak are vital to the condition of your body. Psalm 103:5 says, "Who satisfieth thy mouth with good things(words); so that thy youth is renewed like the eagle's. Notice, it didn't say God satisfieth you, no he said your mouth. He uses the mouth to turn the body. So, hold fast to your confession of faith.