patraṁ puṣpaṁ phalaṁ toyaṁ yo me bhaktyā prayacchati tad ahaṁ bhakty-upahṛtam aśnāmi prayatātmanaḥ

"If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it." The real ingredient is bhakti (devotion). Pure devotion is uncontaminated by the modes of material nature. Ahaituky apratihata: unconditional devotional service cannot be checked by any material condition. This means that one does not have to be very rich to serve the Supreme Personality of Godhead. Even the poorest man can equally serve the Supreme Personality of Godhead if he has pure devotion. If there is no ulterior motive, devotional service cannot be checked by any material condition.