Perfection
"President Hugh B. Brown said, "We take seriously and literally the injunction of the Savior to be perfect. In fact, the Old Testament also teaches that we should be perfect (Deut. 18:13). But what is the perfection that God expects of us here on earth?
We often think perfection is defined as 'flawless' or 'sinless.' But there has been only One in the history of this world who was in every way flawless and sinless. Yet the scriptures say that 'Noah was a just man and perfect' (Gen. 6:9); Job was perfect and upright' (Job 1:1) and Seth was 'a perfect man' (D&C 107:43).
Apparently the scriptural definition of perfection is different from our usual one. In the Bible three Hebrew words and two Greek words are translated into King James English as 'perfect'…None of these five words means 'flawless' or 'sinless.' They are otherwise rendered as 'whole,' 'upright,' 'undefiled,' 'just' or complete. A person who is whole, complete, upright and so forth, is one who, upon sinning, as all mortals do, immediately and thoroughly repents… It is an ongoing process of repenting and improving throughout this life.
Elder Bruce R. McConkie explained: 'We don't need to get a complex or get a feeling that you have to be perfect to be saved. You don't… In order to be saved in the Kingdom of God and in order to pass the test of mortality, what you have to do is get on the straight and narrow path, thus charting a course leading to eternal life; and then being on that path, pass out of this life in full fellowship… If you're on that path and pressing forward and you die, you'll never get off the path.
There is no such thing as falling off the straight and narrow path in the life to come and the reason is that this life is the time that is given to prepare for eternity…Stay in the mainstream of the Church and live as upright and decent people… Keep the commandments, pay your tithing, serve in the organizations of the Church, love the Lord and stay on the straight and narrow path… (If you do), for all practical purposes your calling and election is made sure." (The Book of Mormon, Verse by Verse, Skinner & Ogden, page 161-162)