1 Corinthians 11:19

For there must be also heresies among you, that they which are approved may be made manifest among you.

For there also must be factions among you, that those who are approved may be revealed among you.

For there must be also factions among you, that they that are approved may be made manifest among you.

for it behoveth sects also to be among you, that those approved may become manifest among you;

And indeed, there must be differences among you to show which of you are approved.