Objection: It Is Presumption to Think That Life and Death Are in Your Power
Actually, it is presumption NOT to think so when God’s Word clearly states that they are!
Proverbs 18:21:
Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
The words you say can bring healing or kill you!
Proverbs has numerous passages telling you things that will lengthen your lifespan and things that will cut short your lifespan. (See Is There an Appointed Time for Each Person to Die?) These things are up to YOU, not up to God. It is up to you whether you speak in agreement with the Word (whether regarding healing or anything else) or whether you speak contrary to it.
It should not come as any shock to you that physical life and death are literally in the power of your tongue, because SPIRITUAL life and death are in the power of your tongue, too! It is not up to God whether or not you are born again! With the mouth confession is made unto salvation (Romans 10:10)! If you don’t say WORDS with your mouth, you will not be saved. By your WORDS you shall be justified, and by your WORDS you shall be condemned (Matthew 12:37).
What you say about Jesus (Lord or not Lord) determines your final destiny! How powerful is the tongue! James also talked about the power of the tongue in James 3-2:6, saying that if you can control your tongue, you can bridle your whole body. Jesus said that you will have whatever you say with your mouth and believe in your heart (Mark 11:23), and He did not restrict that to only good things or only bad things. If you believe Jesus’ words, and you should, you see that YOUR TONGUE determines what you will get.
The vast majority of Christians have no understanding or appreciation of the power of their words, and that is why so many of them live defeated lives. They fail to realize how often they “shoot themselves in the foot” with their own words.
Words that agree with God authorize God to move in your life. Words that disagree with God authorize Satan to move in your life.
See the discussion Say What for more information on this topic.