If this world is become full in Krsna consciousness, nobody is working for sense gratification, only for satisfaction of Krsna, this world becomes spiritual world immediately. This requires little time to understand. Anything used for Krsna, simply for Krsna satisfaction, it is spiritual. Just like we are using this microphone for talking about Krsna then it is spiritual. Otherwise what is the difference between this prasadam and ordinary food?
Lecture on Bhagavad-gita 6.1, Los Angeles, 13 February, 1969