Yet reason favors calling it natural: what belongs to nature's right constitution and health is natural
Still, reason seems to require us to say that it belonged to the endowments of nature and was natural rather than supernatural. What belongs to the right constitution of a nature, without which that nature is neither healthy nor rightly formed, is natural, not supernatural.
Human nature without the holiness and righteousness that unfallen man had is not healthy but sick, and cannot be called rightly formed, if indeed the rebellion of the lower faculties against reason and the whole man's tendency to rebel against God are a disease and a defect of rational nature.
Latin
LII. Ratio tamen exigere videtur, ut dicamus illam ad naturae dotes pertinuisse, & naturalem potius fuisse quam supernaturalem. Etenim naturale non supernaturale est, id quod ad naturae rectam constitutionem pertinet, & sine quo natura nec sana est, nec recte constituta. Jam vero natura humana absque Sanctitate & Justitia illa, quae homini integro inerat, non sana, sed aegra est, nec potest dici recte constituta; si quidem facultatum inferiorum adversus rationem rebellio, & pronitas totius hominis ad rebellandum Deo, naturae rationalis morbus est & vitium quoddam.