Procli Diadochi In Primum Euclidis Elementorum Librum Commentarii

...if the logoi rational principles within her flowed into her from elsewhere, according to the subsistence of things moved by others? And how will she differ from matter, which is all things only in potentiality, but generates nothing of the material forms? It remains, then, that she produces these things both from herself and from the intellect, and that she is a fullness of forms, subsisting from the intellectual paradigms while obtaining her passage into existence through her own power. And thus, the soul was not a blank slate original: "γραμματεῖον" void of principles, but is always written upon, writing itself, and being written upon by the intellect. For the soul is also an intellect, unfolding itself according to the intellect that precedes it, and it is an image of that intellect and a stamp original: "τύπος" that has come to be outside. If, therefore, that intellect contains all things intellectually, the soul contains all things psychically; and if he contains them paradigmatically, the soul contains them iconically; and if he contains them in a unified manner, the soul contains them in a divided manner. Knowing this, Plato establishes the soul from all the mathematical forms, divides it by numbers, connects it with proportions and harmonic logoi rational principles, and implants in it the primary principles of figures, both the straight and the curved, and moves the circles within it intellectually. Therefore, all mathematical objects exist primarily in the soul: before the numbers, the self-moving ones; before the visible figures, the zodiaka schemata zodiacal/vital figures; before the harmonized things, the harmonic principles; and before the bodies moving in a circle, the invisible circles have been crafted, and the soul is the fullness of all things; and...