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Śrīmad-Bhāgavatam
[Canto 10, Ch. 9]
Lord had already shown His unlimited potency by killing Pūtanā, Śakaṭāsura and Tṛṇāvarta. Now Kṛṣṇa exhibited another  vibhūti , or display of potency, to mother Yaśodā. “Unless I agree,” Kṛṣṇa desired to show, “you cannot bind Me.” Thus although mother Yaśodā, in her attempt to bind Kṛṣṇa, added one rope after another, ultimately she was a failure. When Kṛṣṇa agreed, however, she was successful. In other words, one must be in transcendental love with Kṛṣṇa, but that does not mean that one can control Kṛṣṇa. When Kṛṣṇa is satisfied with one’s devotional service, He does everything Himself.  Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ . He reveals more and more to the devotee as the devotee advances in service.  Jihvādau : this service begins with the tongue, with chanting and with taking the  prasāda  of Kṛṣṇa.
ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (Bhakti-rasāmṛta-sindhu 1.2.234)
TEXT 16
यदासीतदपि न्यूनं तेनान्यदपि सन्दधे । तदपि द्वयङ्गुलं न्यूनं यद् यदादत्त बन्धनम् ॥१६॥
yadāsīt tad api nyūnam tenānyad api sandadhe tad api dvy-aṅgulam nyūnam yad yad ādatta bandhanam
yadā—when; āsīt—became; tat api—even the new rope that had been joined; nyūnam—still short; tena—then, with the second rope; anyat api—another rope also; sandadhe—she joined; tat api—that also; dvi-aṅgulam—by a measurement of two fingers; nyūnam—remained short; yat yat ādatta—in this way, one after another, whatever ropes she joined; bandhanam—for binding Kṛṣṇa.