Luke Then He called His twelve disciples together and gave them power and authority over all demons and to cure diseases. And He sent them to preach the kingdom of God and to heal the sick. The word for authority in Greek is “exousia” …which according to Strong’s Concordance means, “authority, especially moral authority, influence, (b) of a spiritual power, and hence of an earthly power: right or privilege, conferred power; delegated empowerment (authorization): delegated power as in authority God gives to His saints.”The word power is the Greek “dunamis” meaning “might, power, marvelous works: (a) physical power, force, might, ability, efficacy, energy, ability (properly, ‘ability to perform’); power through God’s ability.” Dýnamis, according to Strong’s Concordance, “is a very important term, used 120 times in the New Testament.”dýnamis (/dýnamai, "able, having ability") – properly, "ability to perform" (L-N); for the believer, power to achieve by applying the Lord's inherent abilities. "Power through God's ability"(power) Inherent: vested in (someone) as a right or privilege