KAṬHA UPANISHAD · 2.1.7

या प्राणेन संभवत्यदितिर्देवतामयी ।
गुहां प्रविश्य तिष्ठन्तीं या भूतेभिर्व्यजायत । एतद्वै तत् ॥ ७॥

yā prāṇena saṃbhavatyaditirdevatāmayī ।
guhāṃ praviśya tiṣṭhantīṃ yā bhūtebhirvyajāyata । etadvai tat ॥ 7॥

This is Aditi, the mother of the Gods, who was born through the Prana and by the mingling of the elements had her being; deep in the heart of things she has entered, there she is seated. This is the thing thou seekest.