in the 15 chp of bhagwat geeta sloka 4 (3rd & 4th line) 
  "tvameva cadyam purusam prapadye 
   yatah pravrittih prasrtta purani" 
    
 here Lord Sri KRSNA in with ARJUNA and still HE tells Arjuna to go and surrender to that lord from whom everything emminates 
  
   why so? 
 could this be explained in detail