We can know someone by what they are called. The Holy Spirit ((Luke 1:15) is called:
The Spirit of Wisdom, Ephesians 1:17, Isaiah 11:2
The Spirit of understanding, Isaiah 11:2
The Spirit of counsel, Isaiah 11:2
The Spirit of Might, Isaiah 11:2
The Spirit of Knowledge, Isaiah 11:2
The Spirit of Fear of the Lord, Isaiah 11:2
The Spirit of Grace, Hebrews 10:29, Zech 12:10
The Spirit of Glory, 1 Peter 4:14
The Spirit of Truth, John 14:17, 15:26. 16:13
The Spirit of the Lord, Isaiah 11:2
The Spirit of Promise, Eph 1:13
The Spirit of Life, Gen 7:22
The Spirit of God, Gen 1:2
The Spirit of Judgement and burning (Isaiah 4:4)
Faithful Spirit (Prov 11:13)
Calm Spirit (Prov 17:27)
Patient Spirit (Eccl 7:8)
Generous Spirit (Psalm 51:12)
Spirit of Justice (Isaiah 28:6)
Humble Spirit (Isaiah 57:15)
Spirit of Power (Acts 1:5-8)
The comforter (John 14)
The good spirit ( Psalm 143:10)
The eternal Spirit (John 14:15)
Holy Spirit is our Advocate (John 14:16)
Holy Spirit also is The Helper (John 14:25-26):
He Intercedes for us and guides our prayers (Rom 8:26-27)
Comforts us (John 14:26)
Convicts of sin (John 16:8-11)
Makes us holy (1 Col 6:11, 2 Col 3:18)
Empowers us (Acts 1:8, Roman 15:13) and much more.
Warning:
“And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.” Ephesians 4:20
The Unpardonable Sin “Therefore I say to you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men. Anyone who speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, either in this age or in the age to come.” Mathew 12:31-32