In Luke 24:49 (TLB) Jesus said, “And now I will send the Holy Spirit upon you, just as my Father promised.”
Who is the Holy Spirit? God as Father? We comprehend that image. God as Jesus, the Son? Well that idea is manageable as well. But God as Spirit? The word itself is mystical.
One day, I read the words Jesus used to describe the Holy Spirit: comforter and friend. I know that Person. That was three decades ago. I no longer think of the Holy Spirit as the Holy Who? I now call him our Heaven-Sent Helper. He is our champion, our advocate, our guide. He comforts and directs us. He indwells, transforms, sustains, and will someday deliver us into our heavenly home.