But you shall receive power, after that the Holy Ghost is come on you: and you shall be witnesses to me both in Jerusalem, and in all Judaea, and in Samaria, and to the uttermost part of the Earth. (Acts 1:8 AKJV)
Right before our Lord ascended into Heaven, He promised His disciples that they would receive the Holy Spirit to empower them. Later in Acts, Paul demonstrated that the Holy Spirit is available to every believer who will devote their life to Jesus as the Lord, Owner, and Master.
There are several names that refer to God, in the Old Testament, that apply to the role of the Holy Spirit. Seeing where these names appear will help us to understand the Holy Spirit better.