The prime purpose of yoga is to control the senses. To control the senses, one has to focus the mind through meditation. Mantra meditation is recommended in the practice of bhakti yoga.

In Sanskrit, man means “mind” and tra means “freeing.” So a mantra is a combination of transcendental, spiritual sounds meant to liberate the mind from the anxieties of life in the material world.

The Hare Krishna mantra is a chant meant for enhancing consciousness to the greatest possible degree. Chanting the Hare Krishna mantra can give peace, happiness, God realization, freedom from repeated birth and death, and total self-fulfillment. Also known as the maha-mantra—great chant—it consists of three Sanskrit names of the Supreme Being; "Hare," "Krishna," and "Rama."

Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare,
Hare Rama, Hare Rama, Rama Rama, Hare Hare

The three words, namely Hara, Krishna, and Rama, are transcendental seeds of the maha-mantra, and the chanting is a spiritual call for the Lord and His internal energy Hara for giving protect the conditioned soul. This chanting is exactly like the genuine cry of a child for its mother. Mother Hara helps the devotee achieve the grace of the Supreme Father, Hari or Krishna, and the Lord reveals Himself to the devotee who chants this mantra sincerely.

Therefore no other means of spiritual realization is as effective in this age of quarrel and hypocrisy as the chanting of the maha-mantra:

Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare,
Hare Rama, Hare Rama, Rama Rama, Hare Hare.