Who is the Holy Spirit?

The Holy Spirit is included in the Trinity, which is made up of 3 distinct persons: The Father, the Son, and the Holy Spirit. They are three distinct Persons, yet they are all one substance - God. Each has a will, can speak, can love, etc., demonstrating qualities of a person.

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Matthew 28:19 — ~"Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit,

John 14:16-17 — ~"I will ask the Father, and He will give you another Helper, that He may be with you forever;
{that is} the Spirit of truth, whom the world cannot receive, because it does not see Him or know Him, {but} you know Him because He abides with you and will be in you.

2 Corinthians 13:14 — The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all.

Acts 2:32-33 — ~"This Jesus God raised up again, to which we are all witnesses.
~"Therefore having been exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He has poured forth this which you both see and hear.