Our ambition is far, far greater, nobler and more sublime than these astronauts because we are trying to reach the Supreme Planet, Krishna Loka, and live there eternally in association with Krishna. Krishna has also advised in Bhagavad-gita that even if we go to the topmost planet, Brahma Loka, still we have to come back again. But if we go to Krishna Loka, there is no coming back to this material world.
Letter to Brahmananda, 24 July, 1969