Once a swami demonstrated with two 'thin rods' how he could detect auras around with them. He told that saying Aum with anything creates negative energy and that after Aum there should be atleast a small pause or Aum should come after the word eg. 'Namashivaya Aum' and only then it will create positive energy. He also 'proved' it with those rods. Is this actually true? I ask this because I like chanting Aum Guru and I’m not really convinced.
Paramhansa Yogananda strongly recommended the mantra, “AUM Guru.” Swami Kriyananda relayed that recommendation to all of us at Ananda. I don’t think you will go wrong with that mantra.
You will encounter many differing points of view among the greater yoga community. Do not try to reconcile them all, because some of them contradict others of them. The important thing is to practice what your guru recommended, because your guru alone can take you to God.