Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
1.2.15
सर्वे वेदा यत्पदमामनन्ति तपांसि सर्वाणि च यद्वदन्ति। यदिच्छन्तो ब्रह्मचर्यं चरन्ति तत्ते पदं सङ्ग्रहेण ब्रवीम्योमित्येतत् ॥१५॥
sarve vedā yatpadamāmananti tapāṁsi sarvāṇi ca yadvadanti। yadicchanto brahmacaryaṁ caranti tatte padaṁ saṅgraheṇa bravīmyomityetat॥15॥
[सर्वे (sarve) - all; वेदाः (vedāḥ) - the Vedas; यत्-पदं (yat-padam) - that goal; आमनन्ति (āmananti) - declare; तपांसि (tapāṁsi) - austerities; सर्वाणि (sarvāṇi) - all; च (ca) - and; यत् (yat) - which; वदन्ति (vadanti) - proclaim; यत्-इच्छन्तः (yat-icchantaḥ) - desiring which; ब्रह्मचर्यम् (brahmacaryam) - celibacy; चरन्ति (caranti) - they practice; तत् (tat) - that; ते (te) - to you; पदं (padam) - goal; सङ्ग्रहेण (saṅgraheṇa) - in brief; ब्रवीमि (bravīmi) - I declare; ओम् (om) - Om; इति (iti) - thus; एतत् (etat) - this;]
I declare to you in brief that goal which all the Vedas declare, which all austerities proclaim, and desiring which they practice celibacy — it is this: "Om".

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बहुचित्रजगद्बहुधाकरणात् परशक्तिरनन्तगुणः परमः ।
सुखरूपममुष्य पदं परमं स्मरतस्तु भविष्यति तत्सततम् ॥
"The one who has created this variegated vast universe with varied forms has infinite power and is of infinite auspicious qualities. He certainly bestows the highest state of bliss to those who meditate on his ever happy essence." -Dwādasha stōtra 4.3

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