Note note 5 — ANALYSIS OF THE PHENOMENA OF THE HUMAN MIND James Mill

5 More properly Similarity is “agreement in difference.” Difference or discrimination is one thing, one element of knowledge or cognition; Similarity or agreement in difference is another thing, the second or completing element of knowledge. The two work together in closest intimacy, but they should neither be looked upon as the same fact, nor as merely a various shading of the same fact. Without difference there would be no similarity; but similarity is difference and something more. At their roots or first origins, the two processes lie in almost undistinguishable closeness; but in their developments they run wide apart. No fact or attribute is known, or mentally possessed, without the union of many shocks of difference with many shocks of identity, or agreement in difference.—B.