Who or what is the Holy Spirit
The Holy Spirit is almost the forgotten member of the Trinity. Christians know that He is a member of the Godhead. But, too many Christians know very little about Him? is the Holy Spirit a force like radar? Is He alive? Or, is He a person like the Father and Son? Though many think they know, a lot do not. The Jehovah's Witnesses and the Christadelphians teach that He is a force like radar. They are wrong. The Mormons teach that He is a male personage of flesh and bones. Actually, the Mormons teach that the Holy GHOST is a god, the male personage, and the Holy SPIRIT is the presence of God the Father. They also are wrong.
The Holy Spirit is the third person in the Trinity. The Trinity is the doctrine that there is only one God in all creation, all time, and all places. This one God exists as three persons: Father, Son, and Holy Spirit. Each person is not the same person as the other, yet there are not three gods, but one. The Holy Spirit is just as much God as is the Father and the Son. But remember, there are not three gods, but One.
The bible has many references to the Holy Spirit and a quick examination of them reveals many interesting characteristics about Him. The following list is taken from a new paper on CARM dealing with the Holy Spirit at http://www.carm.org/doctrine/trinityspirit.htm.
It should be very obvious that the Holy Spirit has self identity, is aware, and is not merely a force because a force doesn't speak, love, grieve, and have a mind. But the cults tend to ignore these verses and tell us that the Spirit is nothing more than some presence or power. Sure, the Spirit is a presence and a power, but that is not all He is. He is the third person in the Trinity. He is the one who applies the redemptive work of Christ to the believer. He is the one who convicts the world of sin (John 16:8), who teaches (John 14:26; 15:26), and who anoints (1 John 2:27).
But, the Holy Spirit is also humble because He points to Jesus (John 15:26). Therefore, anyone who is truly indwelt by the Holy Spirit will likewise bear witness of Jesus.
Okay, so what is the devotional aspect here? Simple, the Holy Spirit indwells you and convictions of righteousness and sin. The Holy Spirit is very active in working in your lives as Christians to bring you into a closer relationship with Jesus. We should know more about the One who makes so much possible with our Savior.