Roland, the holy spirit it what God the father sends down to earth to be with every believer. It gives discretion and wisdom. It can also perform miracles.
Acts 2:1-4 When the day of Pentecost came, they [the disciples] were all together in one place. Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them.
Thanks for the explanation! I guess I had a very vague understanding, but it's good to hear clarification from an actual believer.
As for speaking in tongues, in Mark 16:17 Jesus does say that all believers will have that power. He doesn't mention the holy ghost, but there's no contradiction there.
In Mark 16:18 Jesus also promises
16:18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
Which I think is more problematic
I mean, I can speak in tongues. So can babies, arguably. Even believers can't drink arsenic and live though.
As for Jesus wanting to keep his miracles quiet, I have a few examples on the top of my head.
Mark 1:41-45 has Jesus healing a leper, Jesus telly him to keep quiet so that he could continue his ministry. Unfortunately, the leper told everyone and their grandmother, so Jesus left the town.
Mark 5:43 after Jesus raised a dead girl from the dead, he gave a "strict order" to not tell anyone.
Those are solid examples of Jesus trying to perform miracles secretly. Keep in mind, he was pretty much an enemy of the state.
But, he is also said to have performed miracles to convince groups of people. Why else would he have converted the water to wine?
And besides that, having "signs" follow the apostles and prove their words. (Also something about... Sorry, sleepy... 70(?) men being granted similar powers and sent out to prosyletize with miracles)