various disposition of each, a conjecture, a persuasion, or a conviction of their existence. The reply is simple; these thoughts are also to be included in the catalogue of existence; they are modes in which thoughts are combined; the objection only adds force to the conclusion, that beyond the limits of perception and thought nothing can exist.
Thoughts, or ideas, or notions, call them what you will, differ from each other, not in kind, but in force. It has commonly been supposed that those distinct thoughts which affect a number of persons, at regular intervals, during the passage of a multitude of other thoughts, which are called real, or external objects, are totally different in kind from those which affect only a few persons, and which recur at irregular intervals, and are usually more obscure and indistinct, such as hallucinations, dreams, and the ideas of madness. No essential distinction between any one of these ideas, or any class of them, is founded on a correct observation of the nature of things, but merely on a consideration of what thoughts are most invariably subservient to the security and happiness of life; and if nothing more were expressed by the distinction, the philosopher might safely accommodate his language to that of the vulgar. But they pretend to assert an essential difference, which has no foundation in truth, and which suggests a narrow and false conception of universal nature, the parent of the most fatal errors in speculation. A specific difference between every thought of the mind, is, indeed, a necessary consequence of that law by which it perceives diversity and number; but a generic and essential difference is wholly arbitrary. The principle of the agreement and similarity of all thoughts,
