Bhagavatapurana 11.25.16

11.25.16

yadā cittaṃ prasīdeta indriyāṇāṃ ca nirvṛtiḥ /
dehe 'bhayaṃ mano-'saṅgaṃ tat sattvaṃ viddhi mat-padam //

16. When the mind becomes serene, when in the senses there is a feeling of ease, in the body a sense of fearlessness, and the mind feels no attachment, there, do thou find the Satva guna, where-in I present Myself.