Anaxogoras, of Clyzomanae in Asia Minor, around 500 BC write of nous as an ordering force in the cosmos:
B12: Nous is unlimited and self-ruling and has been mixed with no thing; but is alone itself, by itself ... and nous has control over all things that have soul, both the larger and the smaller; and nous controlled the whole revolution, so that it started to revolve in the beginning.
Roughly a century earlier, in Miletus, Thales had supposed (reported by Aristotle in On the Soul):
all things have souls
In the scriptural corpus of Vedantic Philosophy, the principal Upanishads have a composition date around the turn of the 1st milleneum BCE; the Eesha Upanishad, has:
The Self is one. Unmoving, it is swifter than the mind. The senses lag, but Self runs ahead. Unmoving it outruns pursuit. Out of Self comes the breath that is the life of all things.
The Self is everywhere, without a body, without a shape, whole, pure, wise, all-knowing, far-shining, self-depending, all transcending; it assigns to every period, it's proper duty.
The Self, is sometimes translated as Consciousness; earlier translations had used soul, which had distinctly Christian overtones - which is possibly why Yeats opted for Self in the collaborative translation, excerpted above; (and possibly, the same artifact of translation is apparent in the translations of the Greek above).