In the description of enthusiasm, the author has plainly had in view individual characters, and those too in a light, in which they appeared to him; not clear and discriminate ideas. Hence a mixture of truth and error, of appropriate and inappropriate terms, which it is scarcely possible to disentangle. Part applies to fanaticism; part to enthusiasm; and no small portion of this latter to enthusiasm not pure, but as it exists in particular men, modified by their imperfections--and bad because not wholly enthusiasm. I regret this, because it is evidently the discourse of a very powerful mind;--and because I am convinced that the disease of the age is want of enthusiasm, and a tending to fanaticism. You may very naturally object that the senses, in which I use the two terms, fanaticism and enthusiasm, are private interpretations equally as, if not more than, Mr. Birch's. They are so; but the difference between us is, that without reference to either term, I have attempted to ascertain the existence and diversity of two states of moral being; and then having found in our language two words of very fluctuating and indeterminate use, indeed, but the one word more frequently bordering on the one state, the other on the other, I try to fix each to that state exclusively. And herein I follow the practice of all scientific men, whether naturalists or metaphysicians, and the dictate of common sense, that one word ought to have but one meaning. Thus by Hobbes and others of the materialists, compulsion and obligation were used indiscriminately; but the distinction of the two senses is the condition of all moral responsibility. Now the effect of Mr. Birch's use of the words is to continue the confusion. Remember we could not reason at all, if our conceptions and terms were not more single and definite than the things designated. Enthusiasm is the absorption of the individual in the object contemplated from the vividness or intensity of his conceptions and convictions: fanaticism is heat, or accumulation and direction, of feeling acquired by contagion, and relying on the sympathy of sect or confederacy; intense sensation with confused or dim conceptions. Hence the fanatic can exist only in a crowd, from inward weakness anxious for outward confirmation; and, therefore, an eager proselyter and intolerant. The enthusiast, on the contrary, is a solitary, who lives in a world of his own peopling, and for that cause is disinclined to outward action. Lastly, enthusiasm is susceptible of many degrees, (according to the proportionateness of the objects contemplated,) from the highest grandeur of moral and intellectual being, even to madness; but fanaticism is one and the same, and appears different only from the manners and original temperament of the individual. There is a white and a red heat; a sullen glow as well as a crackling flame; cold-blooded as well as hot-blooded fanaticism. Enthusiasts, [Greek: enthousiastai] from [Greek: entheos, ois ho theos