“For there must be also heresies among you, that they which are approved may be made manifest among you.”
King James Version (KJV)
11:19 There must be heresies - Divisions. Among you - In the ordinary course of things; and God permits them, that it may appear who among you are, and who are not, upright of heart.
1Co 11:19 There must be also heresies among you. Heresies were false opinions which led to divisions. In the state of the human mind they were unavoidable, and would sift the church.