Brahmachari – He is doing so much austerity of getting up for mangal arati, cooking for the Guru, thinking that everything he possesses actually belongs to his Guru. Dedicating his life in the service of Guru. So God is watching that this man is doing so much austerity for his Guru. Prabhupada says “If somebody can remain a brahmachari, 75% of his chances are there of going back to Godhead, if he strictly follows his Guru’s instruction.
If someone really wants to go back to godhead, he must act accordingly. If we want to achieve Phd. 1st class 1st, we have to work hard day and night. Still we may get 2ndclass. But further we can achieve. So whatever we get depends upon our endeavours.
Prabhupada says that every night before sleeping and Srila Bhaktisiddhanta says that on every ekadasi, you should introspect how many vaishnava qualities you have developed to become eligible for going back to godhead.
Strictly follow what Guru says. Don’t commit offense towards the vaishnavas, and then, sure, in one life, you will go back to Godhead.