Garudapurana 2.6.96

2.6.96

manthanaiḥ sādhanairevaṃ paraṃ jñātvā sukhī bhavet /
ātmā nityo 'vyayaḥ satyaḥ sarvagaḥ sarvabhṛnmahān //

by churning with spiritual means, one knowing the Supreme thus becomes happy. / The Self is eternal, imperishable, true, all-pervading, the supporter of all, and great;