Authority is the right to use power in a particular realm or area. authority and power goes together. Men can have power without authority, but you cannot have authority without power. Power is very important but power without authority is useless. . Authority is what make your power meaningful. Power is not in full effect until it is power-full for a believer's power to be power-full he must carry the authority of God. Just like you cannot survive in life without power so you cannot reign in life without authority.