Who is the Holy Spirit in relation to the Trinity, and what does He do?

Les teaches that the Holy Spirit is the third person of the Trinity, identified as God the Father, God the Son, and God the Spirit. He explains that the moment a person believes, the Spirit comes and indwells that believer. Because the believer's body is the temple of the indwelling Holy Spirit, a person cannot check God at the door or leave Him behind; He goes wherever the believer goes. This indwelling means God knows every thought, every place, and everything done, because He is here. Les also compares this to Solomon's temple in Jerusalem, where the Shekinah glory came down and dwelt in the completed temple. That temple was a foreview of this age of grace: when God saves an individual, that person immediately becomes a temple and dwelling place, and just as the Shekinah glory entered Solomon's temple, the Holy Spirit comes into us.