The early church was very powerful, in their preaching, their boldness, their miracles, and in the number of souls that were saved. This was not because of their programs, but because of the Holy Spirit’s dominance in their lives. Bro. Jeff explains here.
Acts 1:8 (KJV)
8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
1 And when the day of Pentecost was fully come, they were all with one accord in one place.
2 And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
1 And as they spake unto the people, the priests, and the captain of the temple, and the Sadducees, came upon them,
2 Being grieved that they taught the people, and preached through Jesus the resurrection from the dead.
3 And they laid hands on them, and put them in hold unto the next day: for it was now eventide.
4 Howbeit many of them which heard the word believed; and the number of the men was about five thousand.
5 And it came to pass on the morrow, that their rulers, and elders, and scribes,
6 And Annas the high priest, and Caiaphas, and John, and Alexander, and as many as were of the kindred of the high priest, were gathered together at Jerusalem.
7 And when they had set them in the midst, they asked, By what power, or by what name, have ye done this?
8 Then Peter, filled with the Holy Ghost, said unto them, Ye rulers of the people, and elders of Israel,
9 If we this day be examined of the good deed done to the impotent man, by what means he is made whole;
10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole.
54 When they heard these things, they were cut to the heart, and they gnashed on him with their teeth.
55 But he, being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God,
56 And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God.
31 And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness.
1 And in those days, when the number of the disciples was multiplied, there arose a murmuring of the Grecians against the Hebrews, because their widows were neglected in the daily ministration.
2 Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables.
3 Wherefore, brethren, look ye out among you seven men of honest report, full of the Holy Ghost and wisdom, whom we may appoint over this business.
33 And with great power gave the apostles witness of the resurrection of the Lord Jesus: and great grace was upon them all.
42 And daily in the temple, and in every house, they ceased not to teach and preach Jesus Christ.
8 And Stephen, full of faith and power, did great wonders and miracles among the people.
9 Then there arose certain of the synagogue, which is called the synagogue of the Libertines, and Cyrenians, and Alexandrians, and of them of Cilicia and of Asia, disputing with Stephen.
10 And they were not able to resist the wisdom and the spirit by which he spake.
41 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
42 And they continued stedfastly in the apostles’ doctrine and fellowship, and in breaking of bread, and in prayers.
43 And fear came upon every soul: and many wonders and signs were done by the apostles.
14 And beholding the man which was healed standing with them, they could say nothing against it.
15 But when they had commanded them to go aside out of the council, they conferred among themselves,
16 Saying, What shall we do to these men? for that indeed a notable miracle hath been done by them is manifest to all them that dwell in Jerusalem; and we cannot deny it.
12 And by the hands of the apostles were many signs and wonders wrought among the people; (and they were all with one accord in Solomon’s porch.
13 And of the rest durst no man join himself to them: but the people magnified them.
14 And believers were the more added to the Lord, multitudes both of men and women.)
15 Insomuch that they brought forth the sick into the streets, and laid them on beds and couches, that at the least the shadow of Peter passing by might overshadow some of them.