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        Adam HaRishon, (the first) man initially was given one commandment.  So it would appear to be from the text.  There is an obvious question.  If Rambam said that Adam was given six commandments where are the rest of them?  I will ask a different question.  Where all of the events and everything that happened necessarily recorded in the text of the Torah itself?  The answer to the later is a resounding no.  Not everything was recorded at least obviously.  Some times you can learn things from what is not recorded.  Also the text itself can hint to certain details that are not said openly.
        There are four levels of interpretation to the Torah.  These four levels are represented by an acronym.  PaRDeS which means paradise in hebrew  P=Pshat (plain sense simple meaning, R=remez (hint), D=drush (analogous), Sod (secret) gematria.  The Lubavitcher Rebbe tells us of another level that pertains to the Yechida.  The nacuda Ha Jehudi, the pentila Yid, this is the central point of all levels, Chasidus.
         Also there is a concept of , Sheviim Panim B'Torah (seventy faces of the Torah).  Really, in actuality there are limitless Chidushim (novelties) in the Torah.  The Torah is eternal, the depth of it can not be fathomed.
         Mishna Perkei Avos 5:21
Ben Bag Bag said:  Learn it and learn it (the Torah), for everything is in it; look deeply into it; grow old and grey over it, and do not stir from it, for there is nothing more  edifying for you than it.
         The Torah is the Wisdom of the creator.  There for, it is eternal, it is new every day.  When Jews bless The Creator before we read the Torah we say, "nosan Ha Torah"  this literally means, "he is giving us the Torah" every moment.  If you could know the mind of The Creator then you could know Torah.  When you learn Torah you connect with the eternal.  The Creator only created with Torah.  He spoke and the world became an entity.  The Torah with its understanding.  This was also given to Moshe and the nation, sons, children, as a  heritage.  Certainly the heritage of the eternal is eternal.  It is the Name of the creator.  Also the name of the children of Israel.  A name that is eternal.