It is amazing David knew about the holyspirit. It literaly means the holyspirit was present even before Jesus promised him to us. The book of Genesis says the spirit of God was hovering over the waters. Saul became purposeless when the spirit of God departed from him. God could nolonger talk to him concerning direction in battles. He resorted to mediums by talking to Samuel's spirit. It's only the spirit of God that comforts and strengthens us. Zechariah 4:6 says , It's not my might nor by power but by the spirit of God.