When I wrote this (1835) I was still _naïf_ enough seriously to believe that Brandis was unacquainted with my work, or I should not allude here to his writings; for they would then be merely a repetition, application and carrying out of my own doctrine on this point, not a corroboration of it. But I thought I might safely assume that he did not know me, because he has not mentioned me anywhere and because if he had known me, literary honesty would have made it his imperative duty not to remain silent concerning the man from whom he had borrowed his chief fundamental thought, the more so as he saw that man then enduring unmerited neglect, by his writings being generally ignored--a circumstance which might be construed as favourable to fraud. Add to this, that it lay in Brandis' own interest as a writer, and would therefore have shown sagacity on his part, to have appealed to me as an authority. For the fundamental doctrine propounded by him is so striking and paradoxical, that even his Göttingen reviewer is amazed and hardly knows what to think of it; yet such a doctrine as this was left without foundation either through proof or induction, nor did Dr. Brandis establish its relation to the whole of our knowledge of Nature: he simply asserted it. I imagined therefore that it was by the peculiar gift of divination, which enables eminent physicians to see and do the right thing in cases of illness, that he had been led to this view, without being able to give a strict and methodical account of the grounds of this really metaphysical truth, although he must have seen how greatly it is opposed to the generally received views. Had he, thought I, been acquainted with my philosophy, which gives far greater extension to this truth, makes it valid for the whole of Nature and founds it both by proof and induction in close connection with Kant's teaching, from which it proceeds as a final result of excogitation--how gladly must he have availed himself of such confirmation and support, rather than to stand alone by an unheard-of assertion which was never further carried out and, with him, never went beyond bare assertion. Such were the reasons that led me to believe myself entitled to take for granted Dr. Brandis' ignorance of my book.