I’m reading William Barclay’s commentary on the letters to the Corinthians and his commentary on chapter 3 is amazing for 2019.
“This identification with some party is the acceptance of slavery by those who should be kings. In fact they are masters of all things, because they belong to Christ and Christ belongs to God. The man who gives his strength and his heart to some little splinter of a party has surrendered everything to a petty thing, when he could have entered into possession of a fellowship and a love as wide as the universe. He has confined into narrow limits a life which should be limitless in it’s outlook.