nānā yoni sadā phire, kadarya bhakṣaṇa kare tāra janma adhaḥ-pāte yāya

"One travels throughout various species of life and eats all kinds of nonsense. Thus he spoils his existence." A man in material existence and attached to ku-visaya or su-visaya is in the same position as that of a worm in stool. After all, whether it be moist or dry, stool is stool. Similarly, material activities may be either pious or impious, but because they are all material, they are compared to stool. Worms cannot get out of stool by their own endeavor; similarly, those who are overly attached to material existence cannot get out of materialism and suddenly become Krsna conscious. Attachment is there. As explained by Prahlada Maharaja in Srimad-Bhagavatam (7.5.30):