John A. Widtsoe teaches Latter-day Saints to expect perfection from no one.
John A. Widtsoe, Program of The Church of Jesus Christ of Latter-day Saints (Salt Lake City: The Deseret News Press, 1937), 171
Expect perfection in no man. The Gospel is perfect; the members of the Church can only strive toward that perfection. If a person earnestly seeks to make himself fully fit before the Lord, the correction of his weaknesses, faults if you choose, will consume all his time and strength, and by comparison, his neighbor will stand high in the scale of moral achievement. Honest self-examination silences faultfinding.