Kant’s proposition, “The _I think_ must accompany all our ideas,” is insufficient; for the “I” is an unknown quantity, _i.e._, it is itself a secret. That which gives unity and connection to consciousness in that it runs through all its ideas, and is thus its substratum, its permanent supporter, cannot itself be conditioned by consciousness, therefore cannot be an idea. Rather it must be the _prius_ of consciousness, and the root of the tree of which that is the fruit. This, I say, is the _will_. It alone is unchangeable and absolutely identical, and has brought forth consciousness for its own ends. Therefore it is also the will which gives it unity and holds together all its ideas and thoughts, accompanying them like a continuous harmony. Without it the intellect would no longer have the unity of consciousness, as a mirror in which now this and now that successively presents itself, or at the most only so much as a convex mirror whose rays unite in an imaginary point behind its surface. But the _will_ alone is that which is permanent and unchangeable in consciousness. It is the will which holds together all thoughts and ideas as means to its ends, and tinges them with the colour of its own character, its mood, and its interests, commands the attention, and holds in its hand the train of motives whose influence ultimately sets memory and the association of ideas in activity; at bottom it is the will that is spoken of whenever “I” appears in a judgment. Thus it is the true and final point of unity of consciousness, and the bond of all its functions and acts; it does not itself, however, belong to the intellect, but is only its root, source, and controller.