This, then, I again repeat, is our ultimate conclusion. All _speculative_ disquisition must begin with _Postulates_, authorised and substantiated by the conscience exclusively. From whatever point the reason may start, whether from the _Things that are seen_ to the One Invisible, or from the idea of the ABSOLUTE ONE to the _things that are seen_, it will in either case find a chasm, which the moral being, the _spirit_ and the _religion_ of man, can alone fill up or overbridge. "THE LIFE IS THE LIGHT OF MAN:" and "WE LIVE BY FAITH." LETTER 179. TO ALLSOP Highgate, April 10th, 1820. My dear Friend, May I venture to obtrude on you what I cannot intrust to a messenger, much less to the post. Sackville-street is not I hope more than fifteen or twenty minutes' walk from your house. It is to inquire if Mr. Caldwell is _in town_; if he be, then to leave the letter, and that is all; but if not, to learn whether he is at his living, and if so, then to transfer his present address to the letter, and put it into the nearest General Post Office box. It is of serious importance to Derwent that the inclosed should reach Mr. Caldwell with as little delay as possible, or I need not say that I should not have taxed your time and kindness merely to make a letter-carrier of you. On Saturday evening I received a note from Mathews, which I have inclosed. I took it very kind of him; but to obtrude myself on Walter Scott, _nolentem volentem_, and within a furlong of my own abode, as he knows (for Mr. Frere told him my address), was a liberty I had no right to take; and though it would have highly gratified me to have conversed with a brother bard, and to have renewed on the mental retina the image of, perhaps, the most extraordinary man, assuredly the most _extraordinary_ writer, of his age, yet I dared not purchase the gratification at so high a price as that of risking the respect which I trust has not hitherto been forfeited by, My dear friend, Your obliged and very affectionate friend, S. T. COLERIDGE. T. Allsop, Esq.