Wahegur Ji Ka Khalsa, Waheguru Ji Ki Fateh, I am confused(very confused) as to how and why Gurugadhi or Guruship is passed down from one Guru to another. I just don't understand it. I know that Guru Nanak Dev Ji did not choose his owns sons to take "Guruship.", but someone who later became Guru Angad Dev Ji. How did this work? How do you transfer one level of consciousness to another simply by a test?