Pupil: It seems quite necessary to prove and demonstrate by necessary and universal proofs that the forms that are in the substance that supports the categories are the object of the action of the simple substance and stem from them.
Master: Your request is a good one: it is in fact very necessary. Here are the proofs that demonstrate that the forms borne by the corporeal substance are the object of the action of the simple and spiritual substances and that they stem from them.
The action of every simple substance is simple. Now the actions that are in the substance that supports the categories are simple. Therefore the actions that are in the substance that supports the categories are the object of the action of the simple substance.
The energies, the forms, and the motions that are in the corporeal substance are more simple and more subtle than the corporeal substance. Now all that is more simple and more subtle than the corporeal substance submits to the domain of the simple substance. Therefore the energies, the forms, and the motions that are in the corporeal substance submit to the domain of the simple substance.
Next, I add to this conclusion the following proposition: All that is in the nature of the simple substance must be either of the essence of the simple substance