Bhagavatapurana 11.29.9

11.29.9

kuryāt sarvāṇi karmāṇi mad-arthaṃ śanakaiḥ smaran /
mayy arpita-manaś-citto mad-dharmātma-mano-ratiḥ //

9. He should, without hurrying, for My delight (one after another) do all the duties, always remembering Me, devoting his mind and heart to Me, while his self and mind find delight only in My duties.