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)

A pure devotee cannot forget the Supreme Lord for a moment, and similarly the Supreme Lord cannot forget His pure devotee for a moment.
(Purport, Bhagavad-gita 8.14)

His (Krishna) transcendental form is the most attractive in all the worlds.
(Purport, Bhagavad-gita 8.21)

Those who are actually engaged in the devotional service of the Supreme Lord are already freed from all reactions.
(Purport, Bhagavad-gita Bg 9.2)

It is said that the execution of devotional service is so perfect that one can perceive the results directly.
(Purport, Bhagavad-gita 9.2)

I (Krishna) am the source of the demigods and the sages.
(Bhagavad-gita 10.2)
(Purport, Bhagavad-gita 9.2)