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PROPOSITION X.
SENSE AND INTELLECT.
Mere objects of sense can never be objects of cognition; in other words, whatever has a place in the intellect (whatever is known) must contain an element which has had no place in the senses; or, otherwise expressed, the senses, by themselves, are not competent to place any knowable or intelligible thing before the mind. They are faculties of nonsense, and can present to the mind only the nonsensical or contradictory.
DEMONSTRATION.
The ego must form a part of every object of cognition (Props. I. II. III.) But the ego cannot be apprehended by the senses; that is, cannot be known as material (Prop. VIII.) Therefore, mere objects of sense can never be objects of cognition; in other word; &c.
