ŚB 1.16.3

It appears from this verse that interplanetary travel by the denizens of higher planets is easy. In many statements in Bhāgavatam, we have observed that the demigods from heaven used to visit this earth to attend sacrifices performed by influential kings and emperors. Herein also we find that during the time of the horse sacrifice ceremony of Mahārāja Parīkṣit, the demigods from other planets were visible even to the common man, due to the sacrificial ceremony. The demigods are not generally visible to common men, as the Lord is not visible. But as the Lord, by His causeless mercy, descends to be visible to the common man, similarly the demigods also become visible to the common man by their own grace. Although celestial beings are not visible to the naked eyes of the inhabitants of this earth, it was due to the influence of Mahārāja Parīkṣit that the demigods also agreed to be visible. The kings used to spend lavishly during such sacrifices, as a cloud distributes rains. A cloud is nothing but another form of water, or, in other words, the waters of the earth transform into clouds. Similarly, the charity made by the kings in such sacrifices was but another form of the taxes collected from the citizens. But, as the rains fall down very lavishly and appear to be more than necessary, the charity made by such kings also seems to be more than what the citizen needs. Satisfied citizens will never organize agitation against the king, and thus there was no need in changing the monarchial state.

Even for a king like Mahārāja Parīkṣit there was need of a spiritual master for guidance. Without such guidance one cannot make progress in spiritual life. The spiritual master must be bona fide, and one who wants to have self-realization must approach and take shelter of a bona fide spiritual master to achieve real success.