For, in the first place, when you come together as a church, I hear that there are divisions among you. And I believe it in part, for there must be factions among you in order that those who are genuine among you may be recognized. - 1 Corinthians 11:18-19 ESV

With regard to food sacrificed to idols, we know that “we all have knowledge.” Knowledge puffs up, but love builds up. If someone thinks he knows something, he does not yet know to the degree that he needs to know. But if someone loves God, he is known by God. (1 Corinthians 8:1-3 NET)

I have applied these things to myself and Apollos because of you, brothers and sisters, so that through us you may learn “not to go beyond what is written,” so that none of you will be puffed up in favor of the one against the other. (1 Corinthians 4:6 NET)

For Jews demand signs and Greeks seek wisdom, but we preach Christ crucified, a stumbling block to Jews and folly to Gentiles, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God. 1 Corinthians 1:22-24 ESV

I appeal to you, brothers, by the name of our Lord Jesus Christ, that all of you agree, and that there be no divisions among you, but that you be united in the same mind and the same judgment. (1 Corinthians 1:10 ESV)