For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
This is a great type of question in which the answer to it has been already provided in the Bible. Let's look back to the beginning around the times of the prophets and the relationship with God and man. They hear from the Lord through the voice of the Holy Spirit delivering unto them what the father has to say and they - the prophets will make the message known to the people concerned. Without the holy spirit been with the people of the old as their supporter, the importance of the Holy spirit wont have been clearly understood by the believers in the word today. Also, with the help of the Holy spirit Saul was able to prophesy, and with many others.