I believe the scriptures give us a good deal of instruction about the assembly, enough to establish that spiritual gifts alone are for the building up of the assembly. However, I'm not talking about the scriptures here, I'm referring to the record of history. It doesn't surprise me at all that history shows that the early Church was entirely distinctive, unlike anything the world had seen. The pagans didn't know what to make of it. It was a new religion which had no physical temple, no obvious designated priesthood, no elaborate ritual. It was a complete contrast to the Jewish system and the pagan idolatry, with all its outward show. The Jews and the pagans had their feasts and revels and music, but the Christians met in private houses, sang simple hymns and songs, held their goods in common, and so on. The pagans could find no moral impropriety to accuse the Christians of, so they had to invent scurrilous rumours (the examples that I know of are too graphic to repeat on a family friendly forum) about the depraved activities that the believers got up to at their 'secret' gatherings. There was nothing in the praise and worship of these early believers that bears any resemblance to the excesses of some gatherings of professing Christians today.