And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. Matthew 28:18
These are bold words, yet coming as they did from the mouth of one who had risen from the dead we must grant their credibility. The question then is, at what point was Jesus given this power? Was it at the moment of his resurrection, or did he possess all power before that?
After the resurrection we see that Jesus still had a body that could be touched, he could prepare food and eat it; nothing in his appearance announced that he was now different. Yet he joined his followers in a closed room without opening a door, then left the same way. Some people might think of this as something similar to Star Trek characters being teleported. However, it does not seem that Jesus was moving miraculously from one place to another in the visible world, but that he was slipping between the created and uncreated spheres, between that which is temporal and that which is eternal.
This is remarkable enough, but before his crucifixion and resurrection he turned water into wine, multiplied the loaves and fishes, healed the sick, raised the dead, cast out demons and healed congenital infirmities.
The greatest display of his power, however, took place on the cross. The battle between Christ and Satan began in heaven and continued on earth. Jewish leaders had expected Messiah to restore their earthly kingdom and give them dominion over their enemies. Jesus had a much greater goal in mind. At the very moment when it seemed that Satan had finally gained a complete victory, the mercy seat in the heavens was anointed with the blood of the Son of God and Satan’s hope of victory was forever crushed. The veil of the temple split from the top to the bottom, showing that all mankind now had free access to the mercy seat.
Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; and having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it. Colossians 2:14-15
It was therefore necessary that the patterns of things in the heavens should be purified with these; but the heavenly things themselves with better sacrifices than these. For Christ is not entered into the holy places made with hands, which are the figures of the true; but into heaven itself, now to appear in the presence of God for us: nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; for then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself. Hebrews 9:23-26
What seemed to be a fatal weakness was actually a display of power that transcends any other that we could imagine. That should give us a pretty good clue as to how God expects us to witness of his power to others. Because the foolishness of God is wiser than men; and the weakness of God is stronger than men. 1 Corinthians 1:25
And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen. Matthew 18:18-20