Luke 7:8

For I also am a man subject to authority, with soldiers under me; and I say to this one, “Go,” and he goes and to another, “Come,” and he comes, and to my slave, “Do this,” and he does it.”

The definition of authority is someone with the power and might to make decisions and give orders. Jesus had that power and authority here on earth. The centurion had faith in Jesus and His authority, and the servant was healed. Jesus gave us the authority to access healing here on earth. When we believe we will receive.