xy

Book VIII, 8.89
As quoted in A Historical Commentary on Thucydides: A Companion to Rex Warner’s Penguin Translation, David Cartwright/Rex Warner, University of Michigan Press (1997), p. 298 : ISBN 0472084194
In the Richard Crawley translation, this quote is rendered as follows : [U]nder a democracy a disappointed candidate accepts his defeat more easily, because he has not the humiliation of being beaten by his equals.
History of the Peloponnesian War, Book VIII

“If you give way, you will instantly have to meet some greater demand, as having been frightened into obedience in the first instance; while a firm refusal will make them clearly understand that they must treat you more as equals.”

Thucydides History of the Peloponnesian War

Book I, 1.140-[5]
History of the Peloponnesian War, Book I

“That war is an evil is a proposition so familiar to every one that it would be tedious to develop it. No one is forced to engage in it by ignorance, or kept out of it by fear, if he fancies there is anything to be gained by it.”

Thucydides History of the Peloponnesian War

Book IV, 4.59-[2]; "Nobody is driven into war by ignorance, and no one who thinks that he will gain anything from it is deterred by fear." ( trans. http://www.classicpersuasion.org/pw/thucydides/thucydides-passages.php?pleaseget=4.59-64 Benjamin Jowett) <br class="br">History of the Peloponnesian War, Book IV

“In fine, I have written my work, not as an essay which is to win the applause of the moment, but as a possession for all time.”

Thucydides History of the Peloponnesian War

Book I, 1.22-[4]
History of the Peloponnesian War, Book I

“The secret of happiness is freedom and the secret of freedom is courage.”

Thucydides History of the Peloponnesian War

Book II, 2.43
History of the Peloponnesian War, Book II

“Let him remember that many before now have tried to chastise a wrongdoer, and failing to punish their enemy have not even saved themselves; while many who have trusted in force to gain an advantage, instead of gaining anything more, have been doomed to lose what they had. Vengeance is not necessarily successful because wrong has been done, or strength sure because it is confident; but the incalculable element in the future exercises the widest influence, and is the most treacherous, and yet in fact the most useful of all things, as it frightens us all equally, and thus makes us consider before attacking each other.”

Thucydides History of the Peloponnesian War

Book IV, 4.62-[3]-[4]
History of the Peloponnesian War, Book IV

“For the true author of the subjugation of a people is not so much the immediate agent, as the power which permits it having the means to prevent it.”

Thucydides History of the Peloponnesian War

Book I, 69.
History of the Peloponnesian War, Book I

“In practice we always base our preparations against an enemy on the assumption that his plans are good; indeed, it is right to rest our hopes not on a belief in his blunders, but on the soundness of our provisions. Nor ought we to believe that there is much difference between man and man, but to think that the superiority lies with him who is reared in the severest school.”

Thucydides History of the Peloponnesian War

Variant translation: "Instead, we think the plans of our neighbors are as good as our own, and we can't work out whose chances at war are better in a speech. So we always make our preparations in action, on the assumption that our enemies know what they are doing. We should not build our hopes on the belief that they will make mistakes, but on our own careful foresight. And we should not think there is much difference between one man and another, except that the winner will be the one whose education was the most severe." Translation by Paul Woodruff.
Variant translation: "There is no need to suppose that human beings differ very much from one another: but it is true that the ones who come out on top are the ones who have been trained in the hardest school." Note: Some versions omit the "who have been".
Book I, 1.84-[4]
History of the Peloponnesian War, Book I

“Disdain is the privilege of those who, like us, have been assured by reflection of their superiority to their adversary. And where the chances are the same, knowledge fortifies courage by the contempt which is its consequence, its trust being placed, not in hope, which is the prop of the desperate, but in a judgment grounded upon existing resources, whose anticipations are more to be depended upon.”

Thucydides History of the Peloponnesian War

Book II, 2.62-[4]-[5]
History of the Peloponnesian War, Book II