One need only chant the Hare Krishna mahamantra. Everyone engaged in the practice of chanting the Hare Krishna mahamantra will be completely cleansed, from the core of his heart, and be saved from the cycle of birth and death.
Srimad Bhagavatam 7.6.1,
The sound vibration of the Hare Krishna mantra, although presented in the ordinary alphabet, should not be taken as mundane or material.
Srimad bhagavatam 4.9.4,
If one wants to capture Him, one must undertake devotional service.
Srimad Bhagavatam 10.9.10,
The causeless mercy of Lord Vishnu is unparalleled, and such mercy is perceived by the devotees only by the grace of the Lord.
Srimad Bagavatam 1.6.31,
The Lord’s glance is the original cause of material creation.
Srimad Bhagavatam 9.5.5,
Anyone who makes a gift of this great work "Srimad – Bhagavatam" on a full moon day attains to the highest perfection of life by returning to Godhead.