When Was the Holy Spirit Given?

QUESTION: Harmonize the following: "Zacharias was filled with the Holy Ghost." "Holy men spake as they were moved by the Holy Ghost." "For the Holy Ghost was not given because Jesus was not yet glorified." How could men be filled with the Holy Spirit before he was given?

ANSWER: We believe that the Holy Spirit is Divine. Hence he has by his essential presence always been in the world as the author of all the piety in the ages before Christ. But on the day of Pentecost he became officially present. In the mysterious economy of the Trinity, he came to fill the office of the Paraclete. His great work is to glorify Christ, to keep him ever in the minds and hearts of men. Without this office of the Spirit, Jesus would long ago have been forgotten by men. This constitutes the chief difference between the work of the Spirit in the Old Testament and in the New. He has now much better tools to work with, all the facts in Christ's earthly life and all the truths he uttered. 

— Steele's Answers pp. 79, 80