"For even the light of the sun which it has in itself would perhaps escape our sense of sight if a more solid mass did not lie under it. But if someone said that the sun was all light, one might take this as contributing to the explanation of what we are trying to say; for the sun will then be light which is in no form belonging to other visible things … This, then, is what the seeing of Intellect is like; this also sees by another light the things illuminated by that first nature, and sees the light in them; when it turns its attention to the nature of the things illuminated, it sees the light less; but if it abandons the things its sees and looks at the medium by which it sees them, it looks at light and the source of light.
...
What is above life is cause of life; for the activity of life, which is all things, is not first, but itself flows out, so to speak, as if from a spring. For think of a spring that has no other origin, but gives the whole of itself to rivers, and is not used up by the rivers but remains itself at rest, ... or of the life of a huge plant, which goes through the whole of it while its origin remains and is not dispersed over the whole, since it is, as it were, firmly settled in the root.
...
The One is all things and not a single one of them: it is the principle of all things, not all things, but all things have that other kind of transcendent existence; for in a way they do occur in the One; or rather they are not there yet, but they will be. How then do all things come from the One, which is simple and has in it no diverse variety, or any sort of doubleness? It is because there is nothing in it that all things come from it. ... For something like what is in Intellect, in many ways greater, is in that One, it is like a light dispersed far and wide from some one thing translucent in itself; what is dispersed is image, but that from which it comes is truth; though certainly the dispersed image, Intellect is not of alien form."
- Plotinus (c. 204/5 – 270 CE)
