According to (St. Luke 24:49) Jesus certainly told the disciples “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. Tarrying for the Holy Ghost was vital when Jesus walked the earth because Jesus lived under the law, not the age of grace. During Jesus time the Holy Ghost would come upon a man but not live permanently in man. In fact, the Holy Ghost could not come in its fullness until Jesus had ascended to his Father. Thus, it was important to tarry during that time. However, as believers we don’t need to tarry for the Holy Ghost today in the New Testament Church. The Holy Ghost has been released in the earth; the Lord has told us if we will ask we will receive and in fact He desires to give us this Holy Ghost (acc. St. Luke 11:13) “If ye being evil know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him.
We often give Peter a hard time for denying that he ever knew Jesus but the fact is that Peter didn’t have access to the Spirit of God the way we do in the Church age. Peter was not filled with the Spirit and when you are not filled with the Spirit you are subject to say or do anything. But after the church was birthed and the Holy Spirit is free to all who would believe we see Peter standing flat footed preaching the Gospel saying “These are not drunk as ye suppose seeing it is but the third hour of the day, but this is that which was spoken by the prophet Joel…
Thus Peter is now full of the Spirit and so were Paul and many others in the book of Acts. Thus to be full of the Spirit is to have so much of him in you that it manifest itself through signs, miracles and wonders. And if you study the book of Acts you come to see and understand this great work done by and through the power of the Holy Spirit. If you are in Christ and Christ is in you it’s yours. Don’t leave home without it.
God Bless You