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CONFERENCE CXX. How the Ʋnderstanding moves the Will. (Book 120)
'TIs proper to the Understanding not only to conjoyn things wholly different, but oftentimes to abstract and separate such as are perfectly united in one and the same substance, and differ only in accidents, which it severs from their subjects. Hence reflecting upon it self, it distinguishes in its operation two Faculties, to wit, its Cognition and the Reasonable Appetite or Will, although they are one and the same thing, not only in the Soul, whose essence is simple, but also in the Intellect; nor are their objects different, Truth, the object of the Understand∣ing, being convertible and all one with Good, the object of the Will. Hence Civilians acknowledg no Will in those that want Understanding, as Ideots and Children. And as the same Sun-beam that produces light, causes heat too by the continuation of its action, or by its re-union in a Burning-glass: so an object long consider'd or strongly apprehended by the Understanding as good, immediately incites and inflames the same to seek and desire it. So that the cognition of a thing in the Understanding is only Theory, which the Will, applying it self thereunto by desire, reduces into Practice. As the Theorical habit of an Art differs not from the Practical, and the conclusion of a Syllo∣gism is only a dependance upon its two Premisses. Wherefore the Will, which is the practice of the Understandings speculati∣on, and a result of its ratiocination, is not distinguish'd from the Understanding; and to know good, to desire and seek means to possess it, are operations continu'd by one sole moti∣on. Besides, to separate the actions of the Souls faculties, and make them independent one of another, would infer a kind of divisibility in the Soul: but the Will being only a desire, every desire a species of motion, and motion an accident; it is sepa∣rable from its subject, the Understanding, whereof 'tis only an affection and propiety. So that the Intellect and the Will being the same thing, when the former is carried towards an appre∣hended good, we say it moves the Will, as it doth the other powers which it employs in quest of that good, when the same is external and it cannot attain to it by it self.
The Second said, That to know, to will, and to be able, although of the same extent in things purely natural (as in a Stone, whose knowledge, desire, and power to tend to its centre are the same thing) yet are different actions in rational agents. For oftentimes we know without willing, and will what we can∣not do; and sometimes we know not that which we would: Oftentimes we will things not only without, but even against Reason; witness the irregular Appetite of breeding Women