I will give Paul's answer since its not considered cheating in an exam:
But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
My answer is the church and is included in Paul's description of the Mystery of God
"But in the voice of the seventh angel when He shall begin to sound, the mystery of God should be finished as He has declared to His servants the prophets." Keeping in mind that we are part of the mystery of God, seeing a glimpse, acknowledging we don't know as we should, we keep learning and if we think we know we stop learning.