One should try to purchase a ticket to go back home, back to Godhead. The price of such a ticket is one's intense desire for it, which is not easily awakened, even if one continually performs pious activities for thousands of lives. All mundane relationships are sure to be broken in the course of time but once one establishes a relationship with the Supreme Personality of Godhead in a particular rasa, it is never to be broken, even after the annihilation of the material world. — Sri Caitanya Caritamrita, Adi Lila, Chapter 01, Text 56.
Many fanatic spiritual movements have come and gone, but without the flawless philosophy of Krishna, they cannot stand. Therefore I want especially that my books and literature should be distributed profusely. This is our substance, real philosophical information, not some weak sentiments. So try for this, to give all men this Krishna Philosophy and many real devotees will come with us back to home, back to Godhead.
Without being self-controlled, without being disciplined and without being fully obedient, no one can become successful in following the instruction of the spiritual master and without doing so, no one is able to go back to Godhead. — Srimad Bhagavatam, 01.05.24.
To travel in another country, you need visa permission, similarly to go back to Godhead you need permission & mercy from his pure devotee.
The slow march of the sankirtan slowly but steadily takes us back home, back to Godhead.
Real success is to go back to Godhead.
Lecture on Real Success Stories Are in Srimad-Bhagavatam (SB 8.4.15; Ljubljana, Slovenia, 26 Dec 1998)