yathā hemni sthito vahnir
durvarṇaṁ hanti dhātu-jam
evam ātma-gato viṣṇur
yoginām aśubhāśayam
yathā - just as; hemni - in gold; sthitaḥ - situated; vahniḥ - fire; durvarṇam - the discoloration; hanti - destroys; dhātu-jam - due to the taint of other metals; evam - in the same way; ātma-gataḥ - having entered the soul; viṣṇuḥ - Lord Viṣṇu; yoginām - of the yogīs; aśubha-āśayam - the dirty mind.
Although one may practice the mystic yoga system, his actual spiritual advancement is due to the mercy of the Supreme Lord within the heart; it is not directly the result of his austerity and meditation. If one becomes foolishly proud in the name of yoga, his spiritual position becomes ridiculous.