"Our Lord's departure on the Ascension was the very condition of the Apostles receiving Him intimately on Pentecost. If He sent His Spirit then He would not be an external voice or an example to be copied, but a veritable life to be lived: "But when He, the Spirit of Truth, is come, He will teach you all truth. For He shall not speak; and the things that are to come, He will show you." And Again, "The Spirit of Truth Whom the world cannot receive, because it sees Him not, nor knows Him not; but you will know Him because He will abide with you and will be in you." Archbishop Fulton Sheen