It is said that it is possible that we should continue to exist in some mode totally inconceivable to us at present. This is a most unreasonable presumption. It casts on the adherents of annihilation the burthen of proving the negative of a question, the affirmative of which is not supported by a single argument, and which, by its very nature, lies beyond the experience of the human understanding. It is sufficiently easy, indeed, to form any proposition, concerning which we are ignorant, just not so absurd as not to be contradictory in itself, and defy refutation. The possibility of whatever enters into the wildest imagination to conceive is thus triumphantly vindicated. But it is enough that such assertions should be either contradictory to the known laws of nature, or exceed the limits of our experience, that their fallacy or irrelevancy to our consideration should be demonstrated. They persuade, indeed, only those who desire to be persuaded. This desire to be for ever as we are; the reluctance to a violent and unexperienced change, which is common to all the animated and inanimate combinations of the universe, is, indeed, the secret persuasion which has given birth to the opinions of a future state. [Decoration] SPECULATIONS ON METAPHYSICS. I. THE MIND. I. It is an axiom in mental philosophy, that we can think of nothing which we have not perceived. When I say that we can think of nothing, I mean, we can imagine nothing, we can reason of noticing, we can remember nothing, we can foresee nothing. The most astonishing combinations of poetry, the subtlest deductions of logic and mathematics, are no other than combinations which the intellect makes of sensations according to its own laws. A catalogue of all the thoughts of the mind, and of all their possible modifications, is a cyclopædic history of the universe. But, it will be objected, the inhabitants of the various planets of this and other solar systems; and the existence of a Power bearing the same relation to all that we perceive and are, as what we call a cause does to what we call effect, were never subjects of sensation, and yet the laws of mind almost universally suggest, according to the 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.