We have seen this practically. Even a child can take part in the chanting, or even a dog can take part in it. Of course, for one who is too entangled in material life, it takes a little more time to come to the standard point, but even such a materially engrossed man is raised to the spiritual platform very quickly. When the mantra is chanted by a pure devotee of the Lord in love, it has the greatest efficacy on the hearers, and as such, this chanting should be heard from the lips of a pure devotee of the Lord, so that immediate effects can be achieved. As far as possible, chanting from the lips of non-devotees should be avoided.
Milk touched by the lips of a serpent has poisonous effects.
The word Hara is the form of addressing the energy of the Lord, and the words Krsna and Rama are addressing the Lord Himself. The supreme pleasure energy of the Lord helps us to reach the Lord. The material energy, called Maya, is also one of the multi energies of the Lord. The living entities are described as superior to material energy. These three words, namely Hare, Krsna, and Rama, are transcendental seeds of the maha-mantra.