Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
2.2.12
एको वशी सर्वभूतान्तरात्मा एकं रूपं बहुधा यः करोति। तमात्मस्थं येऽनु पश्यन्ति धीरास्तेषां सुखं शाश्वतं नेतरेषाम् ॥१२॥
The One who is the controller and the Inner-Ātmān of all beings manifests in various forms. The wise who perceive him within themselves attain eternal happiness, and not others.

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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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