DIFFERENCE BETWEEN INTELLIGIBLE AND SENSE-QUALITY.
3. The whiteness that I see in you is not a quality, but an actualization of the potentiality of whitening. In the intelligible world all the things that we call qualities are actualizations. They are called qualities because they are properties, because they differentiate the beings from each other, because in respect to themselves they bear a particular character. But since quality in the sense-world is also an actualization, in what does it differ from the intelligible quality? The sense-quality does not show the essential quality of every being, nor the difference or character of substances, but simply the thing that we properly call quality, and which is an actualization in the intelligible world. When the property of something is to be a being, this thing is not a quality. But when reason separates beings from their properties, when it removes nothing from them, when it limits itself to conceiving and begetting different from these beings, it begets quality, which it conceives of as the superficial part of being. In this case, nothing hinders the heat of the fire, so far as it is natural to it, from constituting a form, an actualization, and not a quality of the fire; it is a quality when it exists in a substance where it no longer constitutes the form of being, but only a trace, an adumbration, an image of being, because it finds itself separated from the being whose actualization it is.