An animal (like a small pet, or a horse, bullock, or elephant) must hear a word hundreds or thousands of times before understanding what it means, or what the specific instruction is for them, or even how they should feel. Lord Caitanya has written, “O my Lord, Your holy name alone can render all benediction to living beings, and thus You have hundreds and millions of names like Krsna and Govinda. In these transcendental names You have invested all Your transcendental energies. There are not even hard and fast rules for chanting these names. O my Lord, out of kindness You enable us to easily approach You by Your holy names, but I am so unfortunate that I have no attraction for them.” And “O Govinda, feeling your separation I am considering a moment as twelve years or more than that, and tears are flowing down my cheeks like torrents of rain. I am feeling all vacant in the world without Your presence.” It’s my theory that Srila Prabhupada asked all initiates to chant 16 rounds daily knowing that we are all like ignorant animals, not able to grasp the deeper meaning of the Lord’s Holy Names. Therefore a great deal of repetition and concentration is required.