Second Nephi 2:3

Wherefore, thy soul shall be blessed, and thou shalt dwell safely with thy brother, Nephi; and thy days shall be spent in the service of thy God. Wherefore, I know that thou art redeemed, because of the righteousness of thy Redeemer; for thou hast beheld that in the fulness of time he cometh to bring salvation unto men.

We are redeemed by Christ, not by our own efforts. We have to do our best, but only Christ can make it happen. Our righteousness is always insufficient. Christ's infinite righteousness is always required.