“The man who goes alone can start today; but he who travels with another must wait until that other is ready, and it may be a long time before they get off.”
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Henry David Thoreau 385
1817-1862 American poet, essayist, naturalist, and abolitio… 1817–1862Related quotes
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 180.

“The true traveler is he who goes on foot, and even then, he sits down a lot of the time.”
Paris From My Window (1944)

Book III, Ode 29, lines 65–68.
Imitation of Horace (1685)

“Who waite for dead men shall goe long barefoote.”
Part I, ch 9.
Proverbs (1546)

“Down to Gehenna or up to the Throne,
He travels the fastest who travels alone.”
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
“Who trusts to others for his food,
Waits long e’er he be satisfied.”
Chi per l’altrui mani
S’imbocca, tardi si satolla.
Le Rappresentazion di Tobia, Act I., Scene III. — (Samuella).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 269.

Conversation with Jean Martet (18 December 1927), Ch. 11, p. 167.
Clemenceau, The Events of His Life (1930)
Context: A man who waits to believe in action before acting is anything you like, but he’s not a man of action. It is as if a tennis player before returning a ball stopped to think about his views of the physical and mental advantages of tennis. You must act as you breathe.

Strom Thurmond
Johnson, James W. (2002). Arizona Politicians: The Noble and the Notorious, illustrations by David `Fitz' Fitzsimmons, Tucson: University of Arizona Press. pp 155. ISBN 0-8165-2203-0.
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From Essay XX by Michel de Montaigne (translated by Charles Cotton, Macmillan London 1877).