G-d's greatest gift to man is that He created us in His image. As heretical as it sounds, man and G-d are, in effect, opposite sides of the same coin. Flowing from this is the notion that all aspects of our relationship to G-d must be reflected in our actions towards man, and our actions towards our fellow man must be reflected in our relationship to G-d. This can best be seen in the aseret hadibrot, which can be read both vertically and horizontally.
love your neighbor
One of the cardinal principles of Judaism is the belief in the Divine origin of our Bible. While Moshe Rabbeinu was the greatest of human beings, his input into the wording of the Torah is minimal at best. In this regard, Moshe was not more than a recording secretary, faithfully transcribing the word of G-d.