Of all sacriﬁces, the chanting of Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare is the purest representation of Krishna.
Lord Sri Krishna is the complete form of all existence, both material and spiritual.
Srimad Bhagavatam 2.4.13,
The essence of Bhagavad Gita is that we should always think of Krishna, become His devotee, worship him and offer homage unto him.
Whoever sees Lord Krishna sees a festival. His face and body are fully satisfying for everyone to see.
Srimad Bhagavatam 9.24.65,