Kirtanad eva krsnasya mukta-sangah param vrajet

SB 1.1.21 P Questions by the Sages
This age of Kali is not at all suitable for self-realization as was Satya-yuga, the golden age, or Treta- or Dvapara-yugas, the silver and copper ages. For self-realization, the people in Satya-yuga, living a lifetime of a hundred thousand years, were able to perform prolonged meditation. And in Treta-yuga, when the duration of life was ten thousand years, self-realization was attained by performance of great sacrifice. And in the Dvapara-yuga, when the duration of life was one thousand years, self-realization was attained by worship of the Lord. But in the Kali-yuga, the maximum duration of life being one hundred years only and that combined with various difficulties, the recommended process of self-realization is that of hearing and chanting of the holy name, fame, and pastimes of the Lord.

SB 7.5.23-24 P Prahlada Maharaja, the Saintly Son of Hiranyakasipu

trnad api sunicena
taror api sahisnuna
amanina manadena
kirtaniyah sada harih

A devotee can very peacefully chant the holy name of the Lord by behaving more humbly than the grass, being tolerant like a tree and offering respects to everyone, without expecting honor from anyone else. Such qualifications make it easier to chant the holy name of the Lord. The process of transcendental chanting can be easily performed by anyone. Even if one is physically unfit, classified lower than others, devoid of material qualifications or not at all elevated in terms of pious activities, the chanting of the holy name is beneficial. An aristocratic birth, an advanced education, beautiful bodily features, wealth and similar results of pious activities are all unnecessary for advancement in spiritual life, for one can very easily advance simply by chanting the holy name. It is understood from the authoritative source of Vedic literature that especially in this age, Kali-yuga, people are generally short-living, extremely bad in their habits, and inclined to accept methods of devotional service that are not bona fide. Moreover, they are always disturbed by material conditions, and they are mostly unfortunate. Under the circumstances, the performance of other processes, such as yajna, dana, tapah and kriya–sacrifices, charity and so on–are not at all possible. Therefore it is recommended:

harer nama harer nama
harer namaiva kevalam
kalau nasty eva nasty eva
nasty eva gatir anyatha

“In this age of quarrel and hypocrisy the only means of deliverance is chanting of the holy name of the Lord. There is no other way. There is no other way. There is no other way.” Simply by chanting the holy name of the Lord, one advances perfectly in spiritual life. This is the best process for success in life. In other ages, the chanting of the holy name is equally powerful, but especially in this age, Kali-yuga, it is most powerful. Kirtanad eva krsnasya mukta-sangah param vrajet: simply by chanting the holy name of Krsna, one is liberated and returns home, back to Godhead. Therefore, even if one is able to perform other processes of devotional service, one must adopt the chanting of the holy name as the principal method of advancing in spiritual life. Yajnaih sankirtana-prayair yajanti hi sumedhasah: those who are very sharp in their intelligence should adopt this process of chanting the holy names of the Lord. One should not, however, manufacture different types of chanting. One should adhere seriously to the chanting of the holy name as recommended in the scriptures: Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare. Hare Rama, Hare Rama, Rama Rama, Hare Hare.

(by Mahesh Raja)