TAITTIRĪYA UPANISHAD · 2.7

असद्वा इदमग्र आसीत् । ततो वै सदजायत ।
तदात्मानं स्वयमकुरुत । तस्मात्तत्सुकृतमुच्यत इति ।
यद्वै तत् सुकृतम् । रसो वै सः ।
रसंह्येवायं लब्ध्वाऽऽनन्दी भवति । को ह्येवान्यात्कः
प्राण्यात् । यदेष आकाश आनन्दो न स्यात् ।
एष ह्येवाऽऽनन्दयाति ।
यदा ह्येवैष एतस्मिन्नदृश्येऽनात्म्येऽनिरुक्तेऽनिलयनेऽभयं
प्रतिष्ठां विन्दते । अथ सोऽभयं गतो भवति ।
यदा ह्येवैष एतस्मिन्नुदरमन्तरं कुरुते ।
अथ तस्य भयं भवति । तत्त्वेव भयं विदुषोऽमन्वानस्य ।
तदप्येष श्लोको भवति ।

asadvā idamagra āsīt । tato vai sadajāyata ।
tadātmānaṃ svayamakuruta । tasmāttatsukṛtamucyata iti ।
yadvai tat sukṛtam । raso vai saḥ ।
rasaṃhyevāyaṃ labdhvā’’nandī bhavati । ko hyevānyātkaḥ
prāṇyāt । yadeṣa ākāśa ānando na syāt ।
eṣa hyevā’’nandayāti ।
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 ।

In the beginning all this Universe was Non-Existent and Unmanifest, from which this manifest Existence was born. Itself created itself; none other created it. Therefore they say of it the well and beautifully made. Lo this that is well and beautifully made, verily it is no other than the delight behind existence. When he hath gotten him this delight, then it is that this creature becometh a thing of bliss; for who could labour to draw in the breath or who could have strength to breathe it out, if there were not that Bliss in the heaven of his heart, the ether within his being? It is He that is the fountain of bliss; for when the Spirit that is within us findeth his refuge and firm foundation in the Invisible Bodiless Undefinable and Unhoused Eternal, then he hath passed beyond the reach of Fear. But when the Spirit that is within us maketh for himself even a little difference in the Eternal, then he hath fear, yea the Eternal himself becometh a terror to such a knower who thinketh not. Whereof this is the Scripture.

Sri Aurobindo · CWSA 18, p. 221