So far all our steps have been supported by the firm rock of experience. But at this point it fails us, and the solid earth sinks from under our feet, as we press forward in our search after a final theoretical satisfaction, there, where no experience can ever by any possibility penetrate; and happy shall we be, if perchance we gain one hint, one transient gleam, that may bring us a certain measure of content.

What, however, shall not desert us is the honesty that has hitherto attended our procedure. We shall not make shift with dreams, and serve up fairy tales, after the fashion of the so-called post-Kantian philosophers; nor shall we, like them, seek, by a wordy exuberance, to impose upon the reader, and cast dust in his eyes. A little is all we promise; but that little will be presented in perfect sincerity.