The spiritual world there is. Paras tasmat tu bhavo 'nyo 'vyakto 'vyaktat sanatanah [Bg. 8.20]. Everything is there, but we do not take care. We think that "We have understood three bighas of land, my neighborhood" or "this, my India" or "my America," "this planet," "That is sufficient knowledge." No, that is not sufficient knowledge. You have to know so many things. But if you understand Krsna, to understand Krsna means to understand everything.
Lecture on Bhagavad-gita 13.16, Bombay, 10 October, 1973