This confusion is something impersonal; it is an opaque body which interposes itself between the truth and ourselves, and prevents us from contemplating it; but the confusion may also arise directly from those whose mission it is to guide us. I open a book written by some grave thinker who, I imagine, knows his subject thoroughly, and I begin to read in all confidence; at first I think I understand him; then I am stopped by a word, and I wonder what meaning the author has attached to it; a little further I come upon the same word, which now seems invested with another signification; this disconcerts me, and I close the book. I take another, but the same disagreeable surprise awaits me, and I find everywhere terms whose meaning varies to suit the convenience of the author; and what we are to understand by these words is nowhere explained. These defects arise probably from the fact that certain philosophers, taking their confused opinions for new ideas, seek for words in which to express them, and not finding them in their vocabulary, they coin them, using terms to which no precise meaning is attached; which terms remain more or less enigmatical to the authors themselves, and, consequently, unintelligible to the readers; in this way does the confusion of ideas arise and is propagated. A philosopher, I think it was Haman, made the following very true and very alarming statement: “Language is not only the basis of our power of thought, but also the point from which our misunderstandings and errors spring”; and Hobbes also says: “It is obvious that truth and falsehood dwell only with those living creatures who have the use of speech.” But all that I have just said indicates merely a superficial portion of my passing impressions; in going below the surface I find in the past other causes for our present perturbation of mind. For centuries we have frequented schools in order to learn to distinguish truth from error, yet it is always a mixture of truth and error that we are taught. What result had we attained on the eve of the twentieth century? We are still asking ourselves whether science does or does not harmonise with religion. After that we cannot but give ourselves up to the deepest despondency, we cannot but fold our arms in despair and question whether we shall ever see things clearly.