Sanctification goes beyond becoming blameless or re-aligned with God. It means being purified, becoming spotless before the Lord. "Now they, after being sanctified by the Holy Ghost, having their garments made white, being pure and spotless before God, could not look upon sin save it were with abhorrence; and there were many, exceedingly great many, who were made pure and entered into the rest of the Lord their God." (Alma 13:12). Those who are sanctified cannot stand even the appearance of sin, and like Nephi prayed, "shake at the appearance of sin" (2 Ne. 4:31). The sanctified are not just cleansed from sin - they have no desire to sin. The sanctified do not just do no wrong; they are not just free from wrong, they, like the Savior, "[go] about doing good" (Acts 10:38). The sanctified receive the attributes of the Savior upon themselves; they become like Him.
Sanctification comes through the blood of Christ: "But, behold, the righteous, the saints of the Holy One of Israel, they who have believed in the Holy One of Israel, they who have endured the crosses of the world, and despised the shame of it, they shall inherit the kingdom of God, which was prepared for them from the foundation of the world, and their joy shall be full forever.... And [the Lord] cometh into the world that he may save all men if they will hearken unto his voice; for behold, he suffereth the pains of all men, yea, the pains of every living creature, both men, women, and children, who belong to the family of Adam.... And he commandeth all men that they must repent, and be baptized in his name, having perfect faith in the Holy One of Israel, or they cannot be saved in the kingdom of God." (2 Ne. 9:18,21,23). The suffering of Christ was great, "For behold, I, God, have suffered these things for all, that they might not suffer if they would repent; But if they would not repent they must suffer even as I; Which suffering caused myself, even God, the greatest of all, to tremble because of pain, and to bleed at every pore, and to suffer both body and spirit - and would that I might not drink the bitter cup, and shrink." (D&C 19:16-18).