We speak of the matter [of this science] in the sense of its being what the science is about. This is called by some the subject of the science, but … - Duns Scotus

If all men by nature desire to know, then they desire most of all the greatest knowledge of science. So the Philosopher argues in chap. 2 of his first book of the work [Metaphisics]. And he immediately indicates what the greatest science is, namely the science which is about those things that are most knowable. But there are two senses in which things are said to be maximally knowable: either because they are the first of all things known and without them nothing else can be known; or because they are what are known most certainly. In either way, however, this science is about the most knowable. Therefore, this most of all is a science and, consequently, most desirable..."

I say that some things can be said to belong to the law of nature in two ways: One way is as first practical principles known from their terms or as conclusions necessarily entailed by them. These are said to belong to the natural law in the strictest sense, and there can be no dispensation in their regard... But this is not the case when we speak in general of all the precepts of the second table. For the reasons behind the commands and prohibitions there are not practical principles that are necessary in an unqualified sense, nor are they simply necessary conclusions from such. For they contain no goodness such as is necessarily prescribed for attaining the goodness of the ultimate end, nor in what is forbidden is there such malice as would turn one away necessarily from the last end, for even if the good found in these [precepts] were not commanded, the ultimate end could still be loved and attained, whereas if the evil proscribed by them were not forbidden, it would still be consistent with the acquisition of the ultimate end.

loquimur de materia "circa quam" est scientia, quae dicitur a quibusdam subiectum scientiae, uel magis proprie obiectum, sicut et illud circa quod est uirtus dicitur obiectum uirtutis proprie, non subiectum. De isto autem obiecto huius scientiae ostensum est prius quod haec scientia est circa transcendentia; ostensum est autem quod est circa altissimas causas. Quod autem istorum debeat poni proprium eius obiectum, uariae sunt opiniones. Ideo de hoc quaeritur primo utrum proprium subiectum metaphysicae sit ens in quantum ens (sicut posuit Auicenna) uel Deus et Intelligentiae (sicut posuit Commentator Auerroes.)