While there are certain events in the Acts of the Apostles which may seem rather foreign to typical Catholics today (for example, speaking in tongues, healings, mighty winds, etc), upon closer examination we can see the hierarchy and structure of the Church already well formed and growing rapidly in Acts.
We especially see the communion of the believers exercised through ecclesiastical hierarchy -- even St Paul and St Barnabas did not go preach until they were "sent" by the authorities in the Church, and even these apostles were held accountable to Church authorities for their preaching. Most especially, we see the structure of the Church present in the "Council of Jerusalem" related in Acts 15.
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