Proverbs 23:7) This is a true statement because our desires shape our actions, and our actions shape who we become. Therefore the greatest desire we can have is to emulate the life of Jesus Christ.
As Latter-day Saint Christians (Mormons) we take the Savior's charge to be perfect seriously (see Matt. 5:48 & 3 Nephi 12:48). However, we also acknowledge that on our own this commandment is impossible. Only through the Saviors help can we accomplish such a grand feat. However, being perfect is not an instantaneous occurrance; it is a process.
Jusice requires immediate perfection or a punishment when we fall short. Each and everyone of us falls short at one point or another but because Jesus took that punishment, He can now offer us the chance for ultimate perfection and help us reach that goal. He can forgive what justice never could, and He can turn to us now with His own set of requirements.
Jesus Christ requires that we exercise faith in Him, repent, make and keep sacred covenants, and continue doing so until the end (See 3 Ne. 27:19-20). Elder Bruce C. Hafen once said: "The great Mediator asks for our repentance not because we must 'repay' him in exchange for his paying our debt to justice, but because repentance initiates a developmental process that, with the Savior's help, leads us along the path to a saintly character"