Martin Luther:

May a merciful God preserve me from a Christian church in which everyone is a saint! I want to be and remain in the little flock and that church where there are the fainthearted, the feeble, and the ailing, who feel and recognize the wretchedness of their sins, who sigh and cry to God incessantly for comfort and help, who believe in the forgiveness of sin…

— Scott M. Manetsch, Timothy George, and David W. McNutt, eds., 1 Corinthians, vol. 9a of Reformation Commentary on Scripture: New Testament (Downers Grove, IL: IVP Academic, 2017), 29.