Some pages afterwards, in again remarking upon M. Cousin, Hamilton quotes from him as follows: "The condition of intelligence _is difference_; and an act of knowledge is only possible where there exists a plurality of terms." In a subsequent paragraph the essayist argues from this, thus: "But, on the other hand, it is asserted, that the condition of intelligence, as knowing, is plurality and difference; consequently, the condition of the absolute as existing, and under which it must be known, and the condition of intelligence, as capable of knowing, are incompatible. For, if we suppose the absolute cognizable, it must be identified either, first, with the subject knowing; or, second, with the object known; or, third, with the indifference of both." Rejecting the first two, Hamilton says: "The _third_ hypothesis, on the other hand, is _contradictory of the plurality of intelligence_; for, if the subject of consciousness be known as one, a plurality of terms is not the necessary condition of intelligence. The alternative is therefore necessary: Either the absolute cannot be known or conceived at all, or our author is wrong in subjecting thought to the conditions of plurality and difference." In these extracts may be detected an error which, so far as the author is informed, has been hitherto overlooked by philosophers. The logician presents an alternative which is unquestionably valid. Yet with almost, if not entire unanimity, writers have been accustomed to assign plurality, relation, difference, and--to adopt a valuable suggestion of Mr. Spencer--likeness, as conditions of all knowledge; and among them those who have claimed for man a positive knowledge of the absolute. The error by which they have been drawn into this contradiction is purely psychological; and arises, like the other errors which we have pointed out, from an attempt to carry over the laws of the animal nature, the Sense and Understanding, by which man learns of, and concludes about, things in nature, to the Pure Reason, by which he sees and knows, with an _absolutely certain_ knowledge, principles and laws; and to subject this faculty to those conditions. Now, there can be no doubt but that if the logician's premiss is true, the conclusion is unavoidable. If "an act of knowledge is only possible where there exists a plurality of terms," then is it impossible that we should know God, _or that he should know himself_. The logic is impregnable. But the conclusion is revolting. What must be done, then? Erect some makeshift subterfuge of mental impotence? It will not meet the exigency of the case. It will not satisfy the demand of the soul. Nay, more, she casts it out utterly, as a most gross insult. Unquestionably, but one course is left; and that is so plain, that one cannot see how even a Limitist could have overlooked it. Correct the premiss. Study out the true psychology, and that will give us perfect consistency. Hold with a death-grip to the principle