So sane man, intelligent man, should consider that “If I have to prepare myself for going, for being elevated to the higher planetary system, but we have to come back again, ksine punye punar martya-loka, why not endeavor for going back to Krsnaloka?” That is intelligence. But there are big, big yogis, they elevate themselves to the higher planetary system. Before going to the spiritual world, they want to see how the higher planetary system are working. Just like the visitors, tourists, they are going somewhere, and drop, by journey, somewhere to see. But you should not make such ambition. You should endeavor directly going back to home, back to Godhead, Krsna. That should be your endeavor.

Srila Prabhupada; lecture on Bhagavad-gita 2.23-24 — August 27, 1973, London