In conditioned life we are limited in our travelling. But in spiritual life we can travel anywhere. The best example is Nārada Muni. He can travel anywhere he likes. Even in this universe we have got a planet which is called Siddhaloka, the planet of the perfect. Not perfect completely, but they are called siddhas. Siddha means almost perfect. The inhabitants of that planet, they can travel without any aid of sputnik or aeroplane from one planet to another. We get this information from Śrīmad-Bhāgavatam.
So in spiritual life we have got complete freedom to move, to act, to enjoy. So that spiritual knowledge should be cultivated. That is the best utilization of this human form of life. If we do not utilize this human form of life for spiritual cultivation, then we are practically committing suicide, ātma-han.
There is a very nice Sanskrit verse that . . . just like you have to cross a great ocean. Now, if you want to cross Atlantic Ocean from New York to England, then you must have a very nice ship and a good captain, and the atmosphere very favorable. Then it is very easy to cross. So that example is given in a Sanskrit verse, nṛ-deham ādyaṁ su-labhaṁ su-kalpam (SB 11.20.17).
Now, to cross this ocean of material existence . . . this is ocean. It is compared with ocean. Bhava-sāgara. Sāgara means ocean. So to cross this ocean you have got very nice ship. What is that? Nṛ-deham: this human form of life. Nṛ-deham ādyam. It is very nice ship. And su-labhaṁ, su-labhaṁ su-durlabham. Su-labham means this kind of ship you cannot get always. It is an opportunity.