I suppose it depends on whether you interpret "all you can do" as "all you are able to do given your mortal limitations such as genetics, poverty/wealth, parenting, life's circumstances" or "all that is possible to be done." If you are thinking the interpretation is the latter, you exclude even the Lord...since He doesn't do all things Himself, and didn't do all things during his earthly time. It seems much more reasonable to interpret this as "all you are able to do given your life's situation." As has been pointed out, Stephen Robison's book Believing Christ outlines this doctrine very beautifully. One of my favorite parts is the Parable of the Bicycle. His daughter saved up all her money for a new bike, but it was clear that she would never have enough, at least not at that point in time. So dad bought her a bicycle, taking "all" that the child could give (possibly a few cents) and making up the difference. Thus it is with our Savior. We cannot meet the requirements. It is in the design. We are supposed to allow the Savior to make us whole and meet the demands of justice. Why do GA's and prophets emphasize the doing part? Possibly because part of our fallen nature is to say to ourselves, "Well, I don't have to do 100% because the Lord will take care of it. I can (in Nephi's words) lie a little, take advantage of my neighbor because of his words, and still be eligible for the Kingdom because the Lord will make up for what I don't do." This is one of Satan's great lies. We MUST be giving our best. If our best is poor, then that is acceptable. If our best is very, very good, then that is what is required. "Of him to whom much is given, much is REQUIRED. (emphasis mine)." Not, "much is expected", not, "much is asked"...the words are: much is REQUIRED. We are REQUIRED, as a condition of continuing spiritual growth and eventual exaltation, to give our very best. We know, the Lord knows, just what that is at any given time in our lives.