“But if I cast out demons by the spirit of God, surely the kingdom of God has come upon you.”
Check out that verse – “…by the Spirit of God… the kingdom of God.”
As Bill Johnson says –
The Holy Spirit encompasses the Kingdom. While they are not the same, they are inseparable.
Examine also the lives of any major figure who is known for moving in Signs and Wonders – you will find they were peculiarly dependent on the Spirit of God being with them to minister effectively.
If they couldn’t feel the Holy Spirit present, then not much happened in terms of ministry.
For some, like Billy Bray, the removal of the Holy Spirit was the removal of their ministry, even if it was mid-flow in speaking to a large congregation!
Sadly for most people we just go on talking and never praying…