Krishna does not agree to award devotional service to merely anyone. Krishna can easily offer a person material happiness or even liberation, but He does not agree very easily to award a person engagement in his devotional service. Devotional service can in fact be attained only through the mercy of a pure devotee. — The Nectar of Devotion, Page 14.
The holy name of Krishna is so attractive that anyone who chants it — including all living entities, moving and nonmoving, and even Lord Krishna Himself — becomes imbued with love of Krishna. This is the effect of chanting the Hare Krishna maha-mantra.
Chaitanya Caritamrta, Antya Lila 3.268,
Srila Prabhupada
One does not need great wealth, education or opulence to satisfy the Supreme Personality of Godhead. If one is fully absorbed in love and ecstasy, he needs to offer only a flower and a little water.
Srimad-Bhagavatam 5.3.6,
Srila Prabhupada
Krishna, Krishna’s service and love of Krishna are the three great riches of life.
Chaitanya Caritamrta,
Madhya Lila 20.143