Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
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Irenaeus of Lyons
AD 202
Who also, as Luke says, descended at the day of Pentecost upon the disciples after the Lord's ascension, having power to admit all nations to the entrance of life, and to the opening of the new covenant; from whence also, with one accord in all languages, they uttered praise to God, the Spirit bringing distant tribes to unity, and offering to the Father the first-fruits of all nations. Wherefore also the Lord promised to send the Comforter,