KAṬHA UPANISHAD · 2.2.8

य एष सुप्तेषु जागर्ति कामं कामं पुरुषो निर्मिमाणः ।
तदेव शुक्रं तद्ब्रह्म तदेवामृतमुच्यते ।
तस्मिँल्लोकाः श्रिताः सर्वे तदु नात्येति कश्चन । एतद्वै तत् ॥ ८॥

ya eṣa supteṣu jāgarti kāmaṃ kāmaṃ puruṣo nirmimāṇaḥ ।
tadeva śukraṃ tadbrahma tadevāmṛtamucyate ।
tasmim̐llokāḥ śritāḥ sarve tadu nātyeti kaścana । etadvai tat ॥ 8॥

This that waketh in the sleepers creating desire upon desire, this Purusha, Him they call the Bright One, Him Brahman, Him Immortality, and in Him are all the worlds established; none goeth beyond Him. This is the thing thou seekest.

Sri Aurobindo · CWSA 18, p. 121