The real GuruAnandamayee Mas opinion was that each person is his own guru because each person listens to himself. He listens to his mind or his heart, so he is his own guru. Whatever comes to his mind, he does. Whatever he feels, he does. Therefore, each individual is his own guru.
But again, she felt that there is only one real Guru, one highest Guru, and that is the Self.
Sri Chinmoy, The power of kindness and other stories, Agni Press, 2011