bhaktyāham ekayā grāhyaḥ
śraddhayātmā priyaḥ satām
bhaktiḥ punāti man-niṣṭhā
śva-pākān api sambhavāt
bhaktya -- by devotional service; aham -- I; ekaya -- unalloyed; grahyah -- am to be obtained; sraddhaya -- by faith; atma -- the Supreme Personality of Godhead; priyah -- the object of love; satam -- of the devotees; bhaktih -- pure devotional service; punati -- purifies; mat-nishtha -- fixing Me as the only goal; sva-pakan -- dog-eaters; api -- even; sambhavat -- from the contamination of low birth.
Sambhavat indicates jati-doshat, or the pollution of low birth. Jati-dosha does not refer to mundane social, economic or professional status, but rather to one's degree of spiritual enlightenment. All around the world, many people are born into rich and powerful families, but they often acquire abominable habits that are part of their so-called family tradition. However, even unfortunate persons who are taught from birth to engage in sinful activities can at once be purified by the potency of pure devotional service. Such service must have Lord Krishna as the only goal (man-nishtha), must be rendered with full faith (sraddhaya), and must be unalloyed, or without any selfish motivation (ekaya).