kṛti-sādhyā bhavet sādhya
kṛti-sādhyā bhavet sādhya-bhāvā sā sādhanābhidhā |
nitya-siddhasya bhāvasya prākaṭyaṁ hṛdi sādhyatā ||
(Bhakti-rasāmṛta-sindhu: 1.2.2)
“[When it is] To be accomplished by activity and that by which bhāva is to be accomplished, that [viz., uttama-bhakti] shall be known as sādhana [-bhakti]. Eternally accomplished bhāva’s manifestation into the heart is [the intended sense of] its being to be accomplished.”