The Holy Spirit is not an added extra..it is ESSENTIAL to our Christian journey.

“And while staying with them he ordered them not to depart from Jerusalem, but to wait for the promise of the Father, which, he said, “you heard from me; for John baptized with water, but you will be baptized with the Holy Spirit not many days from now.””
‭‭Acts‬ ‭1‬:‭4‬-‭5‬ ‭ESV‬‬