Letters to Harrison Gray Otis Blake edited by Wendell Glick: from Great Short Works of Henry David Thoreau edited, with an introduction, by Wendell Glick (New York: Harper & Row, 1982). Reprinted courtesy of HarperCollins Publishers).
H.G.O. Blake on Thoreau and their correspondence (excerpted from Henry Salt's The Life of Henry David Thoreau. London: Bentley, 1890. pp. 144-146):
I was introduced to him first by Mr. Emerson more than forty years ago, though I had known him by sight before at college. I recall nothing of that first interview unless it be some remarks upon astronomy, and his want of interest in the study as compared with studies relating more directly to this world — remarks such as he made here and there in his writings. My first real introduction was from the reading of an article of his in the Dial on "Aulus Persius Flaccus," which appears now in the Week. That led to my first writing to him, and to his reply, which is published in the volume of letters. Our correspondence continued for more than twelve years, and we visited each other at times, he coming here to Worcester, commonly to read something in public, or being on his way to read somewhere else.
As to the outward incidents of our intercourse, I think of little or nothing that it seems worth while to write. Our conversation, or rather his talking, when we were together, was in the strain of his letters and of his books. Our relation, as I look back on it, seems almost an impersonal one, and illustrates well his remark that "our thoughts are the epochs in our lives: all else is but as a journal of the winds that blew while we were here." His personal appearance did not interest me particularly, except as the associate of his spirit, though I felt no discord between them. When together, we had little inclination to talk of personal matters. His aim was directed so steadily and earnestly towards what is essential in our experience, that beyond all others of whom I have known, he made but a single impression on me. Geniality, versatility, personal familiarity are, of course, agreeable in those about us, and seem necessary in human intercourse, but I did not miss them in Thoreau, who was, while living, and is still in my recollection and in what he has left to us, such an effectual witness to what is highest and most precious in life. As I re-read his letters from time to time, which I never tire of doing, I am apt to find new significance in them, am still warned and instructed by them, with more force occasionally than ever before; so that in a sense they are still in the mail, have not altogether reached me yet, and will not probably before I die. They may well be regarded as addressed to those who can read them best.