In the first century, Christians had miraculous operations of Jehovah’s holy spirit in some matters of judgment, such as in the judgment of Ananias and Sapphira. (Acts 5:1-11; 1 Cor. 12:4-11) After miraculous gifts of the spirit ceased with the death of the apostles, Christians have not expected direct miraculous indications from heaven as to how a matter should be decided.
"Those who make up the one true Christian organization today do not have angelic revelations or divine inspiration. But they do have the inspired Holy Scriptures, which contain revelations of God's thinking and will." Jehovah's Witnesses - Proclaimers of God's Kingdom (1993) p.708
"....they be blind leaders of the blind. And if the blind lead the blind, both shall fall
into the ditch." (Matthew 15)
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The ancient church had one thing that the Jehovah's Witnesses don't have, and that is apostolic authority. Jesus imbued His church with this authority anciently and He personally laid His hands on each apostle and ordained them with the authority and keys to effectively act in His name. This authority included that to cast out devils, baptize by water, confer the gift of the Holy Spirit, bind in Heaven and Earth and to ordain church officers. It also gave them the right to speak and act in God's name without taking upon themselves that honor and being self appointed.
God has never had a church on Earth without the gift of revelation and authority being conferred from On High. The General Body has never had a revelation (as noted above), has never been given authority, does not have the authority to bind on Heaven or Earth, does not have authority to establish congregations or call and ordain others. And they have not the Spirit of God or they would know they needed that authority.
Jesus talked about "blind guides leading the blind." One cannot see without the spirit of revelation. Man doesn't print a placard, start a church, graduate from Divinity School and build a bunch of churches without authority. And finally, the ancient church had an open canon of scripture. That means that as God revealed "new light" to His apostles and prophets, they could write it down and add it to their existing canon. The Christian world of today has only the 66 books of the Bible; however, the ancient church had quite a bit more that we don't have today.