The best means of spiritual realization is chanting the holy name of the Lord.
Bhagavad Gita 6.11-12,
Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare. In Kali-yuga, if this Vedic maha-mantra is chanted regularly and heard regularly by the devotional process of shravanam kirtanam, it will purify all societies, and thus humanity will be happy both materially and spiritually.
Srimad Bhagavatam 4.18.14,
In this material world there are only two representatives of the Supreme Personality of Godhead; the transcendental sound vibration of the Holy Name and his eternally transcendental deity incarnation.
Cut the Anarthas with Scissor of Holy names of the Lord.
The sound vibration of the Hare Krishna mantra, although presented in the ordinary alphabet, should not be taken as mundane or material.
Srimad bhagavatam 4.9.4,
Chaitanya Mahaprabhu has recommended that everyone should chant the Hare Krishna mantra just to cleanse the dust from the heart. If the dust of the heart is cleansed away, then one can actually understand the importance of the holy name.