In the beginning, the Self alone. It shapes the worlds and a Person, enters through the crown of the head — and the text ends: consciousness is Brahman.
Dialogues in this Upanishad
The Self Alone in the Beginning — The Self alone, then worlds, then a Person shaped from the waters. The gods enter him as speech, breath and sight — and the Self enters by the crown.
Consciousness Is Brahman — The seer Vamadeva knew the births of the gods in the womb. Then the question: who is this Self we worship? The answer is the Rigveda's great saying.