Jesus had been external to them. Often they missed Him. Sometimes
He was asleep when they felt they sorely needed Him. Sometimes He
was on the mountains, while they were in the valley vainly trying
to cast out stubborn devils, or wearily toiling on the tumultuous,
wind-tossed sea. Sometimes He was surrounded by vast crowds, and
He entered into high disputes with the doctors of the law, and
they had to wait till He was alone to seek explanations of His
teachings. But they were never to lose this other Helper in the
crowd, nor be separated for an instant from Him, for no human
being, nor untoward circumstance, nor physical necessity, could
ever come between Him and them, for, said Jesus, "He shall be in
you."

From the words used to declare the sayings, the doings, the
offices and works of the Comforter, the Holy Spirit, we are
forced to conclude that He is a Divine Person. Out of the
multitude of Scriptures which might be quoted, note this passage,
which, as nearly as is possible with human language, reveals to
us His personality: "Now there were in the Church that was at
Antioch certain prophets and teachers... As they ministered to
the Lord, and fasted, the Holy Ghost said, Separate Me Barnabas
and Saul for the work whereunto I have called them. And when they
had fasted and prayed, and laid their hands on them, they sent
them away. So they, being sent forth by the Holy Ghost, departed
into Seleucia" (Acts xiii. 1-4).

Further on we read that they "were forbidden of the Holy Ghost to
preach the word in Asia"; and when they would have gone into
Bithynia, "the Spirit suffered them not" (Acts xvi. 6, 7).