The Holy Spirit is a person. A teacher. A companion. He is the presence and power of the Godhead. Before the experience, Peter was cowardly, denying Jesus Christ. After the experience, he won thousands to Christ Jesus instead.
Obey the voice of the Holy Spirit within you moment by moment. Don't take His instruction lightly. Each instruction is linked to an event in your future.
"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 Judea, and in Samaria, and unto the uttermost part of the earth."