John 16:7-8
It is to your advantage that I go away; for if I do not go away, the Helper will not come to you; but if I depart, I will send Him to you.
The Spirit is the servant of all – you can see his servant hood in the beginning of creation and through out the life of God’s written word and history of man. He has all the power of the universe, yet moves when the Father tells Him too. He has served the Father, man, and the Son of God since day one. This is one of the reasons why Jesus preferred the Holy Spirit at the end of His ministry. He honored who was last, to be first. When Jesus left his disciples, he was so happy, because He knew that man was about to get his inheritance back – The Spirit of God, the “Promise” that was given to man from dawn of light.