Bhagavatapurana 10.83.39

10.83.39

ātmārāmasya tasyemā vayaṃ vai gṛha-dāsikāḥ /
sarva-saṅga-nivṛttyāddhā tapasā ca babhūvima //

39. Servants indeed in His household these we, are of the Lord who finds delight in Himself: certainly renouncing attachment to everything else and by tapas we should become more deserving of Him. (and to that state we have attained certainly by renouncing everything else and by the virtue of tapas).