1 Corinthians 11:19

For there must be [Luke 17:1; Matthew 18:7; Matthew 10:11] also factions among you, that they that are approved may be made manifest among you. [A carnal spirit tends to division (1 Corinthians 3:1-4; 1 John 2:18-19). The divisive spirit in the perverse and carnal, manifests, by contrast, the loving, united spirit of the obedient and spiritual, which is approved. "Approved" is the cognate opposite of "rejected" found at 1 Corinthians 9:27. The word "division" used in the verse above was a milder term than "factions" found here. The former represented parties separated by present or at least very recent dissensions, while the latter described matured separations and looked toward permanent organizations. If the former might be regarded as a war of secession, the latter would describe that condition when the war was practically ended, and the two parties were almost ready to establish themselves as separate, independent and rival governments. But factions did not thus mature in Paul's time, nor does Clement's epistle written forty years later indicate that they had matured in his time. No doubt, this epistle of Paul's had much to do in checking their development.]