Real guru will not talk differently. Some guru says that, "In my opinion, you should like this." And some guru will say, "In my opinion, you'll do this." They are not guru; they are all rascals. Guru has no "own" opinion. Guru has got only one opinion, the same opinion which was expressed by Krishna, Vyasadeva, or Narada, or Arjuna, or Sri Caitanya Mahaprabhu, or the Gosvamis. You'll find the same thing.
Srila Prabhupada, Lecture: What is a Guru? London, August 22, 1973