The Universal-Form of the Lord is no easy experience for anyone, and it can be gained neither by study of the Vedas, nor by austerities, nor by gifts, nor by a sacrifice. Even the gods, the denizens of heaven, with their ampler intellects, longer lives, and harder endeavours, are unable to behold this Universal-Form, and they keep on longing for this experience.

And yet, Krishna has shown this Form, mighty and wondrous, to His friend through His Grace, as He Himself admitted earlier.

We may wonder what makes the Lord shower His grace upon one, and not upon another. It CANNOT be a haphazard distribution of an Omnipotent, who does things as He likes, arbitrarily, without any rhyme or reason! For, in that case the Lord will be accused of partiality and arbitrariness.

HERE, IN THE FOLLOWING STANZA, WE GET THE SCIENTIFIC EXPLANATION OF WHAT COMPELS THE LORD TO SHOWER HIS SPECIAL FAVOURS UPON SOMEONE SOMETIMES, AND NOT UPON ALL AT ALL TIMES:

Na vedaih, not through the Vedas, not even through the four Vedas-Rk, Yajus, Sama and Atharvan; na tapasa, not by austerity, not by severe austerities like the Candrayana; not danena, by gifts, by gifts of cattle, land, gold, etc.; na ca, nor even; ijyaya, by sacrifices or worship; sakyah aham, can I; drastum, be seen evamvidhah, in this form, in the manner as was shown; yatha, as; drstavan asi, you have seen mam, Me. ‘How again, can You be seen? This is being answered: