وينبغي أن يعلم أنه لا يبحث عن وجود الموضوع ولا يبحث عن ماهيته في العلم الذي هو موضوع له
The existence and essence of a science's own subject are not ordinarily the questions it sets out to prove within that science.
Medicine studies health and disease of the body without having to establish the body's very existence through a new philosophical demonstration in each medical argument.
The point concerns the order of investigation: the discipline takes its subject as understood and investigates its proper predicates. Foundational questions about the subject may belong to a preliminary or another discipline.