Complete, whole, and fully developed; totally righteous. Perfect can also mean without sin or evil. Only Christ was totally perfect. True followers of Christ may become perfect through His grace and Atonement.
Faith is not to have a perfect knowledge of things,
Alma 32:21, 26.
The Atonement was made so that God might be a perfect God,
Moroni was a man of perfect understanding,
Alma 48:11–13, 17–18.
The Spirit of Christ is given to every man to judge and know with a perfect knowledge whether something is of God or the devil,
Come unto Christ, and be perfected in him,
Continue in patience until ye are perfected,
These are they who are just men made perfect through Jesus,
The offices in the Church are for the perfecting of the Saints,
D&C 124:143 ( Eph. 4:11–13).
The living are not perfect without their dead,
D&C 128:15, 18.