Bhagavad Gīta Bhāshya and Tātparya
B.G 17.26
सद्भावे साधुभावे च सदित्येतत् प्रयुज्यते। प्रशस्ते कर्मणि तथा सच्छब्दः पार्थ युज्यते ॥२६॥
sadbhāve sādhubhāve ca sadityetat prayujyate। praśaste karmaṇi tathā sacchabdaḥ pārtha yujyate ॥26॥
[सत् (sat) - existence; भावे (bhāve) - being; साधु (sādhu) - good; भावे (bhāve) - state; च (ca) - and; सत् (sat) - truth / reality; इति (iti) - thus; एतत् (etat) - this; प्रयुज्यते (prayujyate) - is used; प्रशस्ते (praśaste) - auspicious; कर्मणि (karmaṇi) - in action; तथा (tathā) - also; सत् (sat) - truth; शब्दः (śabdaḥ) - word; पार्थ (pārtha) - O son of Pritha; युज्यते (yujyate) - is used;]
The term 'Sat' is employed to denote both existence as a reality and goodness. Likewise, O Arjuna, the word 'Sat' is used to signify auspicious actions as well.

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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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