4.1-3 Evam etc.  upto  uttamam.  Eventhough it has come down by regular  succession of teacher,  it is lost now.  By this  [statement]  the Bhagavat indicates the rarity  (or difficulty)  and respectability of this  knowledge.  You are My devotee and friend too :  You are a devotee having nothing but Me as your final goal and you are a friend too.  This  'too'  indicates the secondary importance  [of the friendship].  Hence, just as in the sentence  'wander  begging food  [etc]',  the importance  lies in the act of begging food,  but unimportance  in the act of bringing the cow;  in the same way, in the present case it is devotion  towards the  teacher that is important  and not the friendship also.  This is the idea intended here.