"...while the Father God and the Son are visibly and personally in heaven, they are invisibly here in the body of the faithful by the indwelling of the Comforter...(this does) not imply that he [Holy Spirit] ...ceased to be in heaven.
Not with God, as with finite man, does arrival in on place necessitate withdrawal from another.
Jesus uttered a saying concerning Himself, so mysterious and seemingly contradictory in the many attempts have been made to explain away its literal and obvious meaning.
"And no man has ascended up to heaven but He that came down from heaven, the Son of man Who is in Heaven.”
Christ on earth, and yet in glory; here but there, at the same time, just as a thought which we embody in speech and send forth from the mind, yet remains in the mind as really and distinctly as before it was expressed." - A.J. Gordon
Spirit of Christ - Our Present Help in Times of Need:
"The Holy Spirit continually and permanently applying Christ's finished work historically from Calvary [where our legal redemption and bodily wholeness was regained through His perfect sacrifice], contemporarily to every new generation of people living in this world." - M.A.F. Wood
Why The Departure of Christ Was Necessary and Helpful:
"In His earthly life, Jesus was geographically limited by His body. He could not be in two places at once. ..In contrast., when the heavenly paraclete [or, Advocate, which is the Holy Spirit] was given, they [Christ's followers] ...exchange[d] Christ's physical presence for His omnipresence. "
- J. Oswald Sanders, The Holy Spirit and His Gifts