ŚVETĀŚVATARA UPANISHAD · 4.16

घृतात् परं मण्डम् इवातिसूक्ष्मं ज्ञात्वा शिवं सर्वभूतेषु गूढं ।
विश्वस्यैकं परिवेष्टितारं ज्ञात्वा देवं मुच्यते सर्वपाशैः ॥

ghṛtāt paraṃ maṇḍam ivātisūkṣmaṃ jñātvā śivaṃ sarvabhūteṣu gūḍhaṃ ।
viśvasyaikaṃ pariveṣṭitāraṃ jñātvā devaṃ mucyate sarvapāśaiḥ ॥

He who knows Siva (the blessed) hidden in all beings, like the subtile film that rises from out the clarified butter, alone enveloping everything,--he who knows the god, is freed from all fetters.