“You see, though we travel together, we travel alone.”

Source: " A Wind Storm in the Forests of the Yuba http://books.google.com/books?id=zj2gAAAAMAAJ&pg=PA55", Scribner's Monthly, volume XVII, number 1 (November 1878) pages 55-59 (at page 59); modified slightly and reprinted in The Mountains of California http://www.sierraclub.org/john_muir_exhibit/writings/the_mountains_of_california/ (1894), chapter 10: A Wind-Storm in the Forests <!-- Terry Gifford, EWDB, page 401 -->
Context: We all travel the milky way together, trees and men; but it never occurred to me until this storm-day, while swinging in the wind, that trees are travelers, in the ordinary sense. They make many journeys, not very extensive ones, it is true; but our own little comes and goes are only little more than tree-wavings — many of them not so much.

1840s, Essays: First Series (1841), Art
Variant: Though we travel the world over to find the beautiful, we must carry it with us or we find it not.
Source: Emerson's Essays
Context: Though we travel the world over to find the beautiful, we must carry it with us, or we find it not. The best of beauty is a finer charm than skill in surfaces, in outlines, or rules of art can ever teach, namely, a radiation from the work of art of human character, — a wonderful expression through stone, or canvas, or musical sound, of the deepest and simplest attributes of our nature, and therefore most intelligible at last to those souls which have these attributes.

"The Harsh Country," ll. 13-16
Prevously Uncollected Poems (1975)

Soldiers Three, The Winners (L'Envoi: What Is the Moral?) http://whitewolf.newcastle.edu.au/words/authors/K/KiplingRudyard/verse/p2/winners.html, Stanza 1 (1888).
Other works

Source: The Art of Travel

Source: Tristes Tropiques (1955), Chapter 4 : The Quest for Power, p. 38
Context: The order and harmony of the Western world, its most famous achievement, and a laboratory in which structures of a complexity as yet unknown are being fashioned, demand the elimination of a prodigious mass of noxious by-products which now contaminate the globe. The first thing we see as we travel round the world is our own filth, thrown into the face of mankind.