bhaktam kamesv acodayat
bhrtya-laksana-jijnasuh—desiring to exhibit the symptoms of a pure devotee; bhaktam—the devotee; kamesu—in the material world, where lusty desires predominate; acodayat—has sent; bhavan—Your Lordship; samsara-bijesu—the root cause of being present in this material world; hrdaya-granthisu—which (desire for material enjoyment) is in the cores of the hearts of all conditioned souls; prabho—O my worshipable Lord.
O my worshipable Lord, because the seed of lusty desires, which is the root cause of material existence, is within the core of everyone’s heart, You have sent me to this material world to exhibit the symptoms of a pure devotee.
Bhakti-rasamrta-sindhu has given considerable discussion about nitya-siddha and sadhana-siddha devotees. Nitya-siddha devotees come from Vaikuntha to this material world to teach, by their personal example, how to become a devotee. The living entities in this material world can take lessons from such nitya-siddha devotees and thus become inclined to return home, back to Godhead. A nitya-siddha devotee comes from Vaikuntha upon the order of the Supreme Personality of Godhead and shows by his example how to become a pure devotee (anyabhilasita-sunyam [Bhakti-rasamrta-sindhu
“One should render transcendental loving service to the Supreme Lord Krsna favorably and without desire for material profit or gain through fruitive activities or philosophical speculation. That is called pure devotional service.” Bhakti-rasamrta-sindhu 1.1.11
Link to this page: https://prabhupadabooks.com/sb/7/10/3