Second Nephi 2:10

And because of the intercession for all, all men come unto God; wherefore, they stand in the presence of him, to be judged of him according to the truth and holiness which is in him. Wherefore, the ends of the law which the Holy One hath given, unto the inflicting of the punishment which is affixed, which punishment that is affixed is in opposition to that of the happiness which is affixed, to answer the ends of the atonement.

Because of the Atonement we are judged on Christ's perfect character rather than on our own imperfect character. It is his truth and holiness, not ours, that answers the judgment.