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1. Historically speaking, where do you come up with most of the sign gifts disappeared for most of the time in the last 1900 years? They didn't cease when believers were hiding as they were being persecuted in the Early Church. I've missed the entire history of the church from @ the 300's to the first millennium. (Never bothered researching it, not to be confused with there was no history back then. lol) I only know what happened in Europe during the Middle Ages, so have no idea what was happening in Africa and Asia. (Fairly certain Christianity hadn't shown up in Aussie and the Americas yet for obvious reasons. lol) You seem to know they showed up again during the Reformation. (I trust you know that. Something I haven't read.) And from what I know of missionaries and people who grew up with true missionary parents or heard stories of missionary work in their family from a generation or two before that, it's still happening in places that aren't so "civilized" that they simply stopped expecting the gifts to cease. So between the gaps in my knowledge, possible gaps in your knowledge too, what has happened in the more recent centuries (The Welsh Revival, Jonathan Edwards, Azusa Street, and the Jesus Movement), and what is happening in Third World countries through missionary work, where is this historic proof they ever ceased? I can definitely say it happened often on Azusa Street and often during the Jesus Movement.
Making general claims about church history can be difficult. So I probably shouldn't have categorically said that most of the sign gifts disappeared most of the last 1900 years of church history. The issue is complex enough that it deserves more than that.
You're completely right that there are many different periods in church history where people claim that these gifts were active. When I try to evaluate these claims (or evidence of activity), I fit them into one of three categories:
1) Third-person, friendly historical claims (for instance, someone today who has a vested interest in believing that the gifts were always active claims that they were active in the 2nd century, etc.);
2) Third-person, unfriendly claims (for instance, in the early church, pagans sometimes conceded to Christian apologists that, yes, Christians in fact were casting out demons);
3) First-person, friendly 'personal-experience' claims or straight-up observational evidence (an example of observational evidence: I have seen that John Knox prophesied in print that the queen would die suddenly before x months, and I have confirmed that it happened just as he said it would; an example of personal-experience claims: all the people who say that they personally have spoken in tongues, have been healed by such-and-such pastor, etc.).
In and of themselves, each of these types of evidence varies in strength. When pagans were conceding to apologists that Christians were casting out demons in the early church, for instance, that's a fairly compelling reason to believe that this was still happening at that time. That is much more compelling, for instance, than if someone tells me they know this still happens from personal experience. Unlike the pagan, they're much more likely to want to believe what they're saying and, so, wishful thinking, etc., may affect their judgement. (Of course, they may be spot on, too. So they aren't discounted out-of-hand. It is just that they get less of the benefit of the doubt than an enemy of Christ who has to concede something he'd refute in a heartbeat, supposing he could.)
In addition to this, there's another thing we have to keep in mind when evaluating miracle claims. (I'm including predictive prophesy and tongue-speaking as 'miracles'.) In particular, we know from Scripture that false and very deceptive miracles were prophesied -- so deceptive they would almost persuade the elect. This tells us that (a) it is possible that a compelling case could be made for false miracles and (b) that we ought to be on-guard against getting duped. As for being on-guard against being duped? Our only safety on this front is to put Biblical theology before miracles, and to put the theology of miracle-workers on trial as much as their miracles. If the miracles are used to support theological error, then I automatically discount them as coming from the Spirit of God (aka, the "Spirit of Truth").
With that background in mind, I tend to discount most miracle claims throughout church history -- though not all. I'm not quick to discount ones directly performed by God, for instance. If we pray for someone to be healed, and they're healed, give God the glory. I do, however, believe it is prudent for Christians to take a default skeptical stance -- initially, at least -- toward any claim that a person laid hands on people and healed them, cast out a demon, etc., while yet remaining open to the evidence. In a few cases at different times in church history, I think the evidence is actually sufficient to think the supposed miracle is probably genuine. They fit into those periods I mentioned above.
As for the specific events you mentioned: The Welsh Revival, Jonathan Edwards, Azusa Street, and the Jesus Movement. Jonathan Edwards is perhaps my favorite theologian, and I've read his works extensively. He dealt with ecstasies and elevated emotional states in the members of his church and community, but I don't know of any evidence that the miraculous gifts were in play at that time. As for the other revivals/movements: I only know a little about them by hearsay, and I don't know enough about the theology that went with them to really evaluate them carefully.
2. You say gifts were for authenticity of new claims. Then here are my questions on that:
a. Given the Bible is about God, and throughout the whole thing, he kept claiming and proving more things about himself, exactly how do you get that it only happened there at that time? For instance, I know Jehovah made himself known in the Far East, because they had a word for God way back before there was even a China. There is historic record of Jao, the great I Am. Since then, they reduced it down to something else (Tao), but there was Jao. There was the great Jove of pre-Roman history. He was THE Jove. He was the great I Am. Only later did they reduce him to Jupiter and give him human characteristics. There is historic proof others heard from the great I Am that I Am. The significance of the Bible also only shows the significance of the Middle East because that's where the great I Am created his path to coming down to redeem those he chose. It's not like God only talked to those we saw in the OT.
I don't believe that every instance of God revealing Himself to someone in ancient times was revealed to us. We know, for instance, that prior to any Scripture being written God communicated to some people in visions, in dreams, and in "sundry" other manners (Heb. 1:1).
"Now a thing was secretly brought to me, and mine ear received a little thereof. In thoughts from the visions of the night, when deep sleep falleth on men, fear came upon me.... Then a spirit passed before my face; the hair on my flesh stood up: it stood still, but I could not discern the form thereof: ... and I heard a voice, saying, Shall mortal man be more just than God? shall a man be more pure than his maker?" (Job 4:12-17)
But we also know that Satan and his demons deceive people with communications, as well. And false religions have sprung up all around the globe, many of them sharing some features with the truth. (Satan is, after all, a great counterfeiter.) So, while I can't entirely discount the claim that very early in history God revealed Himself to some people in the far east, I think there are decent reasons to be skeptical that we can know that He revealed Himself to some people there simply because the name of one of their gods resembles the name of God and possibly even has an overlapping meaning. In fact, if their 'god' had a Satanic character, it would be just as possible that Satan wanted to receive the praise and glory of God and, as a result, "revealed" himself to pagans under similar names and attributes. This is especially the case because divine revelation has been progressive, and the earlier we go in history (after the fall), the less specific his revelation was. So it would be surprising if He was giving His exact name to people in the far east. Notice in the quotation from the book of Job above that Eliphaz (speaking) said "I could not discern the form [of the spirit]." I take this to be a confirmation that -- even in a clear case of a divine revelation at that point in history -- the revelation was murky, unclear, and deficient. Which is why revelation became more and more clear until we finally had the completed canon of Scripture -- everything we need, clearly laid out for us.
b. What makes you think they aren't still needed for authentication? What has changed? Most folks STILL don't trust in God, so he still proves himself for our benefit every day. What has changed other than God has put down, in print, everything he needs us to know about him. The Bible tells us about God. It really does. But God proves himself to many people every single day of the week, every decade, century, millennium since the beginning of Man. Just because we never make the pages of the Bible doesn't mean nothing genuinely miraculous can't and doesn't happen to us. Just because in our limited scope of history we may never know someone who still is gifted like the NT apostles, doesn't mean those people don't exist.
The miraculous gifts of the Spirit are gifts that come from God. As such, they are gifts that will only be given if they are, in God's judgement, going to give Him more glory than not giving them. God, after all, does all things for His own glory.
Now, if this is right and it is also true that the miraculous gifts were used to authenticate leaders at periods of radical change in the history of redemption, then here's the question we should be asking:
Q. Now that the canon is complete and we are in the final major period of the history of redemption (besides, possibly, the millennium), which of the following gives God more glory: (a) people converting because they have seen a sign and believe God is speaking in the Bible because His people are miracle workers, or (b) people converting because they hear God speaking in the Scripture and receive its teachings by faith?
I think option (b) harmonizes with Scripture better than option (a). God does not, in general, seek to satisfy a generation that seeks signs or requires signs and miracles to believe. Even when Christ was walking the earth and performing miracles around every corner, there were people who loved signs and miracles too much for His taste. And he called a generation that seeks signs "wicked". And so on. Meanwhile, the simplicity of faith that simply hears the voice of God in Scripture and humbly submits to it -- without all the fireworks -- is something where God is going to get all the glory. (Too often, when there are human miracle-workers involved, people give the individual too much credit and personality cults form, etc.)
Either way, if it is the case that God receives more glory when people believe without signs and wonders when we're in a stable period of the history of redemption, then that's why the current period would be without them.
One of my hubby's old friends is just such a guy. He was one of the Philadelphia street preachers who brought people to the Lord through words, signs, and miracles in the early 70's during the Jesus Movement. They lost touch in the decades after that only to meet again in a church that believes in systematic theology. The guy was home for a sabbatical (and to seek more backing for his work.) Usually he was in Kenya developing a church planting there as a missionary and told of the signs and wonders he still participated in. He heard the tongues -- the local elders told him what language it was, who understood it, and why the speaker couldn't know what he was saying. (Old language only learned by well educated people and the guy speaking it wasn't educated at all.) The miracles still happened, because in Africa they aren't programmed to believe they can't like First World Nations are. (I have no idea if prophecy happened. Hubby only talked to him for a couple of hours and the subject never came up. He was talking to an old friend, not doing an interview, so much didn't come up then. lol)
How do you wrap that up into systematic theology? It's still happening. I'm going with it never stopped except to people who are programmed to believe it had to have stopped.
Cases like this one in Africa are interesting - especially since they are consistent with the Biblical use of tongues as real languages and used for communication. If the miracles are legit and the theology taught is orthodox and Biblical, then I would probably lean towards this explanation: these miracles can accompany the expansion of Christianity to regions where it hasn't been before because, in a sense, Pentecost is only just happening in those regions now. But once the Gospel has made inroads and Scripture has been established as the word of God, we should expect these signs and wonders to become less and less common until people are completely satisfied by the Word of God alone. Something like that is how I would probably fit it into my systematic theology. But I would be open to hearing arguments for other options.