If the surface of the globe is overflooded with the chanting of the Hare Krishna mantra, the people of the world will be very, very happy.
(Srimad-Bhagavatam, 4.24.10 Purport)
In this age of Kali, if a person does not take advantage of chanting the Hare Krishna mantra, which is offered as a great concession to the fallen human beings of this age, it is to be understood that he is very much bewildered by the illusory energy of the Lord.
(Srimad-Bhagavatam, 4.24.14 Purport)
The Hare Krishna maha-mantra gives liberation and at the same time offers shelter at the lotus feet of Krishna. If one takes shelter at the lotus feet of Krishna after liberation, he develops his dormant ecstatic love for Krishna. That is the highest perfection of life. (Sri Caitanya-caritamrta, Antya-lila, 3.257 Purport)