N.T. If he only existed in this instance, the disputatious brother. Probably the preceding one about the head-dress of women, and transition to what follows. This is the primary reason for Paul's condemnation and the only one given. Example in papyri for splinter of wood. Not yet formal cleavages into two or more organizations, but partisan divisions that showed in the love-feasts and at the Lord's Supper.
Heresy is theoretical schism, schism practical heresy.
It has always been so. Instance so-called Christian Science, Russellism, New Thought, etc., today. The selfish conduct of the Corinthians made it impossible to eat a Lord's Supper at all. Old verb to take before others. It was conduct like this that led to the complete separation between the Love-feast and the Lord's Supper.