WHO IS THE HOLY SPIRIT?

There is no personal name for the Third Person of the Godhead. The Bible does not give us His name. There are various appellations applied to Him throughout Scripture, but they divulge nothing of His personality. They show instead His office and His work, and the relationship which He maintains between God and fallen man in the plan of salvation. He is known variously as the Holy Spirit, the Holy Ghost, the Spirit of Truth, the Spirit of Christ, the Spirit of the LORD, the Comforter. But these are not His name any more than Word or Redeemer is the name of the Second Person of the Godhead. Just as "Word" is used to suggest Christ's unique position as the mouthpiece for the Invisible God, so does the term "Holy Spirit" designate the One who supervises the implanting of God's own nature in the lives of His sons—and daughters—elect. It is through Him that God's own character is imparted to those preparing for citizenship in the heavenly kingdom. He is the "Mighty Ally" in the final conflict for the control of men's minds and hearts.
THE HOLY SPIRIT IS A PERSON: having the characteristics of personality

1. He speaks - 1 Timothy 4:1
2. He intercedes - Romans 8:26
3. He testifies - John 15:26
4. He directs - Acts 16:6,7     
5. He appoints - Acts 20:28
6. He can be lied to - Acts 5:3,4
7. He can be grieved - Ephesians 4:30; Psalm 51:11

THE HOLY SPIRIT IS GOD: having all the attributes of God

1. He is omnipresent - Psalm 139:7
2. He is omniscient - Isaiah 40:13; 1 Corinthians 2:10.11
3. He is omnipotent - Zechariah 4:6; Romans 16:25, cf with John 16:7-13
4. He is called "God" - Acts 5:4

"'The Spirit also helpeth our infirmities;'" and the Spirit, being God, knoweth the mind of God; therefore every prayer of ours for the sick, or for other needs, the will of God is regarded." (Signs of the Times: Oct. 3, 1892)
NAMES OF THE HOLY SPIRIT (87 from both the Old and New Testaments)
Taken together this list of names reveals an amazing amount of information about the Holy Spirit. The first time He is mentioned in the Bible occurs in Genesis 1:2, and the last time is Revelation 19:10. Thus, the work of the Holy Spirit spans the entire Bible, from creation to the final redemption of God's people. This is by no means an exhaustive list. The Third Person of the Godhead has as many names as He has attributes—just as God the Father does.

• Anointing - 1 John 2:27
• Breath of the Almighty - Job 32:8; 33:4; 34:14-15
• Breath of Life - Genesis 2:7
• Breath of the LORD - Isaiah 40:7
• Counselor - John 14:16
• Deposit - Ephesians 1:13-14
• Dew - Hosea 14:5
• Double Portion - 2 Kings 2:9,15
• Dove - Matthew 3:16
• Eternal Spirit - Hebrews 9:14
• Eyes of the Lord - Zechariah 4:10
• Finger of God - Exodus 8:19; Luke 11:20
• Fire - Acts 2:3
• Firstfruits - Romans 8:23
• Gift - Acts 5:3-4
• God's Testimony - 1 John 5:9
• Hand of God - 2 Chronicles 30:12
• His Holy Spirit - Isaiah 63:10-11
• His Spirit - Isaiah 48:16
• Holy Spirit Sent From Heaven - 1 Peter 1:12
• Holy Spirit of God - Ephesians 4:30
• Holy Spirit Who Is In You - 1 Corinthians 6:19
• Holy Spirit Whom He Pour Out - Titus 3:5
• Lamp of the Lord - Proverbs 20:27
• Lord Who Is the Spirit - 2 Corinthians 3:18
• Mind of the LORD - Isaiah 40:13
• My Spirit - Genesis 6:3
• New Spirit - Ezekiel 11:19
• Oil - 1 Samuel 16:13
• One Spirit - 1 Corinthians 12:13
• Power of the Lord - Luke 5:17
• Power of the Most High - Luke 1:35
• Promise - Acts 2:33; Galatians 3:14
• Same Spirit - 1 Corinthians 12:4
• Seal - Ephesians 1:13
• Servant - Genesis 24:34
• Seven Spirits of God - Revelation 4:5
• The Spirit - Matthew 12:31
• Spirit Above the Waters - Genesis 1:2
• Spirit From On High - Isaiah 32:15
• Spirit Given Without Limit - John 3:34
• Spirit He Gave Unto Us - 1 John 3:24
• Spirit Himself - Romans 8:26
• Spirit of Christ - Romans 8:9
• Spirit of Counsel and Power - Isaiah 11:2
• Spirit of Glory - 1 Peter 4:14
• Spirit of God - Genesis 41:38
• Spirit of Grace - Hebrews 10:29
• Spirit of Grace and Supplication - Zechariah 12:10
• Spirit of Him Who Raised Jesus - Romans 8:11
• Spirit of His Son - Galatians 4:6
• Spirit of Holiness - Romans 1:4
• Spirit of Jesus - Acts 16:7
• Spirit of Jesus Christ - Philippians 1:19
• Spirit of Judgment and Fire - Isaiah 4:4
• Spirit of Justice - Isaiah 28:6
• Spirit of Knowledge and of the Fear of the LORD - Isaiah 11:2
• Spirit of Life in Christ Jesus - Romans 8:2
• Spirit of the Living God - 2 Corinthians 3:3
• Spirit of the LORD - Micah 2:7
• Spirit of Our God - 1 Corinthians 6:11
• Spirit of Power, Love, and Self-Discipline - 2 Timothy 1:7
• Spirit of Prophecy - Revelation 19:10
• Spirit of Sonship - Romans 8:15
• Spirit of the Sovereign LORD - Isaiah 61:1
• Spirit of Truth - John 14:17
• Spirit of Your Father - Matthew 10:20
• Spirit of Wisdom and Understanding - Isaiah 11:2
• Spirit of Wisdom and Revelation - Ephesians 1:17
• Spirit Who Gives Rest - Isaiah 63:14
• Spirit Who Goes Out From the Father - John 15:26
• Spirit Who Is From God - 1 Corinthians 2:12
• Streams of Living Water - John 7:38
• Streams on the Dry Ground - Isaiah - 44:3
• Vindicator of Christ - 1 Timothy 3:16
• Water - Zechariah 14:8
• Wind - John 3:8
• Wine - Ephesians 5:18
• Your Good Spirit - Nehemiah 9:20
• Your Presence - Psalm 139:7
• Your Spirit - Nehemiah 9:30
• Your Spirit of Creation and Renewal - Psalm 104:30

"It is the Spirit that makes effectual what has been wrought out by the world's Redeemer. It is by the Spirit that the heart is made pure. Through the Spirit the believer becomes a partaker of the divine nature. Christ has given His Spirit as a divine power to overcome all hereditary and cultivated tendencies to evil, and to impress His own character upon His church." by Innocent Morris