Bhagavad Gīta Bhāshya and Tātparya
B.G 7.04
भूमिरापोऽनलो वायुः खं मनो बुदि्धरेव च। अहङ्कार इतीयं मे भिन्ना प्रकृतिरष्टधा ॥४॥
The Earth, the water, the fire, the air, the space, the mind, the intellect, and the ego principle — are the eightfold divisions of the 'Prakrti', the insentient, that is mine.
Gīta Bhāshya 7.04
Lord starts revealing his special knowledge. The 'mahat' principle is implied by the word 'ahaṅkāra', i.e. the ego principle.
प्रतिज्ञातं ज्ञानम् आह - भूमिः इत्यदिना। महतः अहङ्कारे एव अन्तर्भावः ॥४॥
Earlier stated knowledge (about the Lord) is declared in 'bhūmiḥ' and subsequent verses. The 'mahat' principle (stated in the standard Sankhya darshana) is also implied by the word 'ahaṅkāra' i.e. the ego principle.

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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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