No one disputes the theological fact that in the strictest of sense the New Testament truly came into effect (part of its content was spoken earlier by the prophets but it only came into effect) from the book of Acts after the resurrection of Jesus beginning with the outpouring of the Spirit.
Interestingly it is called the book of Acts, the Acts of the apostles. Our introduction to the New Testament tells us we have entered into a new world of action, where the Spirit of God is demonstrative recognized in the nature of His works in and through men. We cannot have an accurate New Testament theology that doesn’t show itself in our walk and works, the nature of works it produces in man.
No man truly abides in what is termed “In Christ realities” and it doesn’t affect his walk. If we abide in Him it will produce a walk just like His.
1 John 2:6 “He that saith he abideth in him ought himself also so to walk, even as he walked”
There was a story of a sorcerer by the name Barjesus, Paul made a pronouncement on him which produced an effect upon the people around. In Acts 13:11, Paul said these words
“And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist and a darkness, and he went about seeking some to lead him by the hand”
The deputy who saw what was done recognized the power in what was called the doctrine of Christ. He saw the works of God on men whom they had considered hitherto as the mighty and powerful and he quickly understood something superior had come. Hear what the next verse had to say in relation to doctrine.
Acts 13:12 “Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord”