{Must be} (dei einai). Since moral conditions are so bad
among you (cf. chapters 1 to 6). Cf.  Mt 18:7 . {Heresies}
(haireseis). The schisms naturally become {factions} or
{parties}. Cf. strifes (erides) in  1:11 . See on 涉c 15:5| for
haireseis, a choosing, taking sides, holding views of one
party, heresy (our word). "Heresy is theoretical schism, schism
practical heresy." Cf.  Tit 3:10  2Pe 2:1 . In Paul only here and
 Ga 5:20 . {That} (hina). God's purpose in these factions makes
{the proved ones} (hoi dokimoi) become {manifest} (phaneroi).
"These haireseis are a magnet attracting unsound and unsettled
minds" (Findlay). It has always been so. Instance so-called
Christian Science, Russellism, New Thought, etc., today.