“As a rule it is circumstances that make men.”

Herodotus, Book 7, Ch. 49; Misattributed to Euripedes in "The Imperial Four" by Professor Creasy in Bentley's Miscellany Vol. 33 (January 1853), p. 22
Variant translation: Circumstances rule men; men do not rule circumstances.
Misattributed

The Eighteenth Brumaire of Louis Bonaparte (1852)
Context: Men make their own history, but they do not make it as they please; they do not make it under self-selected circumstances, but under circumstances existing already, given and transmitted from the past. The tradition of all dead generations weighs like a nightmare on the brains of the living. And just as they seem to be occupied with revolutionizing themselves and things, creating something that did not exist before, precisely in such epochs of revolutionary crisis they anxiously conjure up the spirits of the past to their service, borrowing from them names, battle slogans, and costumes in order to present this new scene in world history in time-honored disguise and borrowed language. Thus Luther put on the mask of the Apostle Paul, the Revolution of 1789-1814 draped itself alternately in the guise of the Roman Republic and the Roman Empire, and the Revolution of 1848 knew nothing better to do than to parody, now 1789, now the revolutionary tradition of 1793-95. In like manner, the beginner who has learned a new language always translates it back into his mother tongue, but he assimilates the spirit of the new language and expresses himself freely in it only when he moves in it without recalling the old and when he forgets his native tongue.
When we think about this conjuring up of the dead of world history, a salient difference reveals itself. Camille Desmoulins, Danton, Robespierre, St. Just, Napoleon, the heroes as well as the parties and the masses of the old French Revolution, performed the task of their time – that of unchaining and establishing modern bourgeois society – in Roman costumes and with Roman phrases.

The Dominant Idea (1910)
Context: Let us have Men, Men who will say a word to their souls and keep it — keep it not when it is easy, but keep it when it is hard — keep it when the storm roars and there is a white-streaked sky and blue thunder before, and one's eyes are blinded and one's ears deafened with the war of opposing things; and keep it under the long leaden sky and the gray dreariness that never lifts. Hold unto the last: that is what it means to have a Dominant Idea, which Circumstance cannot break. And such men make and unmake Circumstance.

"Rules vs Men: Lessons from a Century of Monetary Policy", Originally published in Christoph Buchheim, Michael Hutter, and Harold James, eds., Zerrissene Zwischenkriegszeit Beiträge (1994), republished in Comparative Political Economy: A Retrospective (2003)

Book XXII, sec. 38
History of Rome

The Crisis No. IV.
1770s, The American Crisis (1776–1783)
Context: Men who are sincere in defending their freedom, will always feel concern at every circumstance which seems to make against them; it is the natural and honest consequence of all affectionate attachments, and the want of it is a vice. But the dejection lasts only for a moment; they soon rise out of it with additional vigor; the glow of hope, courage and fortitude, will, in a little time, supply the place of every inferior passion, and kindle the whole heart into heroism.

Misattributed, Jackson's personal book of maxims

Conversation with Emmanuel, comte de Las Cases (11 November 1816), Mémorial de Sainte Hélène, v. 4, p. 133 http://books.google.com/books?id=945jAAAAMAAJ&pg=PA133.
Context: I may have had many projects, but I never was free to carry out any of them. It did me little good to be holding the helm; no matter how strong my hands, the sudden and numerous waves were stronger still, and I was wise enough to yield to them rather than resist them obstinately and make the ship founder. Thus I never was truly my own master but was always ruled by circumstances.