With enough of _mental vigour_ to advance still farther in the tracks, of science that are already formed, and to point out new tracks to those who are to follow, we have enough of _weakness_ to prevent us from exploring and exhausting, what is to occupy, in the same happy search, the millions of millions that are to succeed us. Truth itself, indeed, will always be progressive; but there will still, at every stage of the progress, be something to _discover_, and abundance to _confute_. “In 24,000 years,” to borrow the prediction of a very skilful prophet,--“In 24,000 years, there will arise philosophers, who will boast, that they are destroying the errors which have been reigning in the world for 30,000 years past; and there will be people who will believe, that they are then only just beginning to open their eyes.” In these remarks, on the nature of our varied consciousness, and on the unity and identity of the mind in all its varieties,--we have considered the mental phenomena in their _general_ aspect. We have now to consider them as arranged in kindred classes,--or rather to attempt the difficult task of the classification itself. To this I shall proceed in my next Lecture. FOOTNOTES: [51] Reid's Essays on the Intellectual Powers, Essay III. Chap. vi. [52] Essay concerning Human Understanding, B. ii. c. xxvii. sect. 20. [53] Essay concerning Human Understanding, B. ii. c. xxvii. sect. 9. [54] Pleasures of Imagination, (first form of the poem,) B. i. v. 166-171. 173-5. [55] ----Why departs the soul Wide from the track.--ORIG. [56] Pleasures of Imagination, (second form of the Poem,) B. i. v. 213-220. LECTURE XVI. ON THE CLASSIFICATION OF THE PHENOMENA OF MIND.