As we know, Paul wrought mighty miracles, as Peter and the Pentecostal believers had done. In fact, a comparison of Paul's miracles with those of Peter shows Paul's to have been the mightier. This was mainly in divine confirmation of his apostleship, since Paul was not one of "the twelve" (2 Cor. 12:11-12).

But it is clear from a study of Paul's ministry and his epistles that these miraculous demonstrations were to vanish away as "the dispensation of the grace of God" was fully ushered in by the end of Acts. Paul preached only the pure "gospel of the grace of God" for ALL men that Christ gave him from heaven.  You can see that the miracles had passed by these verses; 1 Cor. 13:8; Rom. 8:22,23; 2 Cor. 4:16-5:4; 12:10; Phil. 3:20,21; 1 Tim. 5:23; 2 Tim. 4:20.

In Paul's epistles we see that by having Christ within us, as seen by the words of Paul's mystery gospel, gives us power for living in the face of adversity... this then is a demonstration of the new way of living in victory by trusting the Christ Paul's "mystery" gospel (Col 1:25-27).

In fact, in Paul's last seven epistles nothing whatsoever is said about signs, miracles, healings, tongues (other languages without having learned them), visions or the casting out of demons.

So Paul's message of the cross and the pure grace of God seen in his message of "the mystery" replaced the preaching of "the Law" and the "gospel of the kingdom" that Jesus and "the twelve" had proclaimed to Israel. Jesus was now ascended to heaven and "the Twelve" were not much heard from after Paul was converted in Act 9, after Paul came with his new gospel for ALL men including "the Gentiles."

How, then, does God now empower His servants in their conflict with Satan to free men from his hold on them? The answer is.... by the Holy Spirit through His Word, as it is preached with conviction. There is a lot of evidence as to this in Paul's epistles, including his early epistles.

Here are two examples.

1 Cor. 2:4: "And my speech and my preaching was not with enticing [persuasive] words of man's wisdom, but in demonstration of the Spirit and of power."

This was power in Paul's preaching, not in performing miracles. Indeed at the very same time when he proclaimed his God-given message with such power, he himself was very weak, for in the preceding verse he says: "And I was with you in weakness, and in fear, and in much trembling."

The other example is seen in I Thes. 1:5.

"For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance…"

In Thessalonica also, Paul had suffered much opposition and persecution, until the whole city was in an uproar (Acts 17:1-5), and this may well have been the result of his powerful preaching. Out of the "uproar," however, sprang the beloved Thessalonian church, an example and inspiration to those won to Christ under more peaceful circumstances.

Note that Paul did not have, or would he have, utilized the Madison Avenue techniques we see used in evangelical churches today to "entertain" his listeners. He no doubt was passionate but did not rely upon manipulating the hearers emotions.

When we in our preaching and teaching mingle Law and grace to any degree at all, we negate grace... grace must be pure 100% or it is not grace at all.

"But if it is by grace (His unmerited favor and graciousness), it is no longer conditioned on works or anything men have done. Otherwise, grace would no longer be grace [it would be meaningless]. (Romans 11:6)

 We don't preach methods and techniques, but rather the power of God through the preaching of Christ's cross... and His resurrection life indwelling the believers as their source for living.