Where Did the Holy Spirit Come From?

 

Per the Nicene Creed:

[The Holy Spirit] proceeds from the Father and the Son.

Per the Holy Bible:

But I will send you the Advocate—the Spirit of truth. He will come to you from the Father and will testify all about me.

John 15:26

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Truth is...It seems reasonable to me to believe that humans have not invented the Holy Spirit and that He is a real aspect of the Triune God. I mean, why would anyone make up something as hard to understand as this?