Your Prayers Must Be Sincere.
“Regarding your questions. If your prayers are sincere then Krishna will accept them and if Krishna accepts them then automatically I accept them, and if I accept them then automatically Krishna accepts them. So like this Krishna is everywhere. He is even between the atoms. So therefore wherever you are He will accept your prayers, and therefore I automatically accept. But the most important part again, the prayer must be sincere.”
(Srila Prabhupada Letter, February 19, 1973)