Authority

It Is Written, Matthew 28:18-20,  Jesus, however, came there and said to them, all authority in Heaven and on earth has been given to me.  Go therefore and make disciples of all the nations; baptize them in the name of the father, and of the son, and of the Holy Spirit;  and teach them to observe every command which I have given you.  And remember, I am with you always, day by day, until the close of the age.
Jesus had been given authority over everything by the father.  Jesus when He was going back to Heaven, delegated that power to the disciples so that they could do His work on earth till He comes back.
The vast majority of believers aren't even aware that that power passed to all believers through the centuries.  We have it, but very few use it.  When you pronounce your authority over illness, for instance in Jesus name and tell it to leave, it will.  First you have to realize how that authority works.
Here is an example.  When you get married, a duly authorized person performs the ceremony.  That person's authority comes from the state. The person performing the ceremony knows that they have the authority to do it, the couple knows that person has the authority, so no one questions it.
If this or any couple wants a divorce, that can only be granted by the state through authorized individuals.  Again authority in action.
When you are authorized to act for another, you are in effect taking the place of that person or agency because they gave you that authority.  Your actions are backed up by the power of the one doing the authorizing.
The authority Jesus gave us works the same way.  The apostles proved it, and it was passed on to all future believers.  Jesus cannot lay hands on anyone, He cannot tell satan to leave someone.  He cannot witness to people about salvation.  He needs our hands, feet, and mouth in order to exercise His power, compassion, and love.
What Jesus gives us, by His own laws, He cannot take back, because He would be breaking His word.  His word to all of us was the great commission.  His work is waiting for us.  Have a blessed day.                 Praise the Lord!
Remember Jesus Loves You
Prayer of Salvation
Lord Jesus, I thank you for what you did on the cross for me.  Your blood washed away all my sins, by your stripes I was healed, your death and resurrection brought me salvation.  Please forgive my sins, and come into my heart as my personal Savior.
Thank You Lord
 Amen