And, behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye be endued with power from on high. (Luke 24:49)
Because of the adamic nature we carry within, it is necessary to have something within us to assist us in fulfilling and achieving the will of God. That ‘something within’ is spiritual power which Jesus promised to us upon His ascension.
For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance; as ye know what manner of men we were among you for your sake. (1 Thessalonians 1:5)
But Barnabas took him, and brought him to the apostles, and declared unto them how he had seen the Lord in the way, and that he had spoken to him, and how he had preached boldly at Damascus in the name of Jesus. (Acts 9:27)
By the word of truth, by the power of God, by the armour of righteousness on the right hand and on the left, (2 Corinthians 6:4,7)