Final answer:
The state of the soul that utilizes theoretical principles understood by intuitive reason is the Rational Soul, according to Aristotle. This is uniquely human and allows for the ability to reason and contemplate theoretical principles.
Step-by-step explanation:
The state of the soul that makes use of theoretical principles grasped by intuitive reason, according to Aristotle, is the Rational Soul. Aristotle's conception of the soul includes three kinds: the vegetative soul, responsible for growth and nutrient exchange; the sensitive or appetitive soul, which adds the capacity for desire and movement; and the rational soul, uniquely human, which enables the ability to reason and contemplate theoretical principles.
Aristotle posited that only the human soul has the capability to engage in rational thought and to employ intuitive reason to grasp theoretical principles. The rational soul ascends to the level of the eternal by intelligent apprehension of particulars, moving away from passions to contemplation of ideals and forms.