
The Supreme Lord is the purest of the pure. Therefore, anyone who is constantly Krishna conscious is also the purest of the pure.
(Purport, Bhagavad-gita 8.5)

By chanting Hare Krishna, one fixes his mind always on the Supreme Lord.
(Purport, Bhagavad-gita 8.8)

He (Krishna) is the oldest personality because He is the origin of everything; everything is born out of Him.
(Purport, Bhagavad-gita 8.9)

In this age (Kali-yuga) no process of realizing the Supreme is possible except the chanting of the holy names of Lord Krishna.
(Purport, Bhagavad-gita 8.11)

Bhakti-yoga is very simple, pure and easy to perform. One can begin simply by chanting Hare Krishna.
(Purport, Bhagavad-gita 8.14)