Many Believers can testify to the working of the Holy Spirit in their lives, even, as they look back, before they were saved.

However, mixed or incorrect teachings have left many Believers ignorant, confused or hardly aware of the Father's promise. 

A good example of it's importance is shown in Acts 19. While on his travels Paul came across some disciples in Ephesus.

When he discovered they were missing out on New Covenant Kingdom inheritance understandings, He began ministering to them.

He revealed his Kingdom thinking when He asked them this question:

"'Did you receive the Holy Spirit when you believed'.

"So they said to him, 'We have not so much as heard whether there is a Holy Spirit'.

But he said to them, 'Into what then were you immersed?' So they said, 'Into John's immersion'.

Then Paul said, 'John indeed immersed with an immersion of repentance, saying to the people that they should believe on Him who would come after him, that is, on Christ Jesus.'

When they heard this, they were immersed in the name of the Lord Jesus.

And when Paul had laid hands on them, the Holy Spirit came upon them and they spoke with tongues and prophesied," Acts 19'1-6.

How would you answer that question? Remember, the Promise of the Father is for all Disciples.