The Godhead is one. It consists of three Persons: the Father, the Son, and the Holy Spirit. The Father and Son have their own personalities, as the Holy Spirit does too. The Holy Spirit is the third person of the Godhead. The issue regarding the existence of the Holy Spirit has been debated among Christians. Some argue that the Holy Spirit just comes out of the Father or of the Son. Others believe that the Holy Spirit is a Person or a Being, that the Holy Spirit has a personality as well as the Father and the Son. The issue discussed in this study is about whether the biblical evidence supports the idea that the Holy Spirit is a living Being or just a power (a substance). A further purpose of the study is to understand the concept held by an influential twentieth-century writer (E. G. White) about the Holy Spirit, especially as it relates to the nature of Holy Spirit as a Person or a Being. This writer uses four titles regarding the Holy Spirit as well as the Father and the Son. They are: (1) Three powers in heaven; (2) Three living Persons in heaven; (3) Three Characters in heaven; and (4) Three Dignitaries in heaven. However, the nature of the Holy Spirit is a mystery for human beings.