Bhagavatapurana 3.27.21

3.27.21

/0 śrī-bhagavān uvāca
animitta-nimittena sva-dharmeṇāmalātmanā /
tīvrayā mayi bhaktyā ca śruta-sambhṛtayā ciram //

21. The Lord said:—When by the performance of one’s own duties and by means of the purity of heart (mind), and intense devotion developed through a long course of study;