Passage
Taittiriya Upanisad TaittU_2,7.1
san taittiriya
asad vā idamagra āsīt tato vai sad ajāyata / tadātmānaṃ svayamakuruta tasmāt tat sukṛtamucyata iti / yadvai tat sukṛtam raso vai saḥ / rasaṃ hyevāyaṃ labdhvānandī bhavati / ko hyevānyātkaḥ prāṇyāt yadeṣa ākāśa ānando na syāt / eṣa hyevānandayāti / yadā hyevaiṣa etasminnadṛśye 'nātmye 'nirukte 'nilayane 'bhayaṃ pratiṣṭhāṃ vindate atha so 'bhayaṃ gato bhavati / yadā hyevaiṣa etasminnudaramantaraṃ kurute atha tasya bhayaṃ bhavati / tattveva bhayaṃ viduṣo manvānasya / tadapyeṣa śloko bhavati