19 No doubt there have to be differences among you to show which of you have God’s approval.

Read 1 Corinthians 11:19 Using Other Translations

For there must be also heresies among you, that they which are approved may be made manifest among you.
for there must be factions among you in order that those who are genuine among you may be recognized.
But, of course, there must be divisions among you so that you who have God’s approval will be recognized!