And do not imagine that what we are fighting for is simply the question of freedom or slavery: there is also involved the loss of our empire and the dangers arising from the hatred which we have incurred in administering it. Nor is it any longer possible for you to give up this empire, though there may be some people who in a mood of sudden panic and in a spirit of political apathy actually think that this would be a fine and noble thing to do. Your empire is now like a tyranny: it may have been wrong to take it; it is certainly dangerous to let it go.

Your empire is now like a tyranny: it may have been wrong to take it; it is certainly dangerous to let it go.

(Pericles:) If they attack our country by land, we shall attack theirs by sea;and the devastation, even of part of Peloponnesus, will be a very different thing from that of all Attica. For they, if they want fresh territory, must take it by arms, whereas we have abundance of land both in the islands and on the continent; such is the power which the empire of the sea gives. Reflect, if we were islanders, who would be more invulnerable? Let us imagine that we are, and acting in that spirit let us give up land and houses, but keep a watch over the city and the sea. We should not under any irritation at the loss of our property give battle to the Peloponnesians, who far outnumber us. […] Mourn not for houses and lands, but for men; men may gain these, but these will not gain men. If I thought that you would listen to me, I would say to you, “Go yourselves and destroy them, and thereby prove to the Peloponnesians that none of these things will move you.”

(Book 1 Chapter 143.4-5)

The fall of Empire, gentlemen, is a massive thing, however, and not easily fought. It is dictated by a rising bureaucracy, a receding initiative, a freezing of caste, a damming of curiosity — a hundred other factors. It has been going on, as I have said, for centuries, and it is too majestic and massive a movement to stop.

(Pericles:) Any one can discourse to you for ever about the advantages of a brave defence, which you know already. But instead of listening to him I would have you day by day fix your eyes upon the greatness of Athens, until you become filled with the love of her; and when you are impressed by the spectacle of her glory, reflect that this empire has been acquired by men who knew their duty and had the courage to do it, who in the hour of conflict had the fear of dishonour always present to them, and who, if ever they failed in an enterprise, would not allow their virtues to be lost to their country, but freely gave their lives to her as the fairest offering which they could present at her feast.

(Book 2 Chapter 43.1)

A great empire cannot bring freedom by its own decay to those corners in it where a subject people are prevented from discussing the fundamentals of life. The people feel like children turned adrift to fend for themselves when the imperial routine breaks down; and they wander to and fro, given up to instinctive fears and antagonisms and exaltation until reason dares to take control. I had come to Yugoslavia to see what history meant in flesh and blood. I learned now that it might follow, because an empire passed, that a world full of strong men and women and rich food and heady wine might nevertheless seem like a shadow-show: that a man of every excellence might sit by a fire warming his hands in the vain hope of casting out a chill that lived not in the flesh.

In the lives of emperors there is a moment which follows pride in the boundless extension of the territories we have conquered, and the melancholy and relief of knowing we shall soon give up any thought of knowing and understanding them. There is a sense of emptiness that comes over us at evening, with the odor of the elephants after the rain and the sandalwood ashes growing cold in the braziers, a dizziness that makes rivers and mountains tremble on the fallow curves of the planispheres where they are portrayed, and rolls up, one after the other, the despatches announcing to us the collapse of the last enemy troops, from defeat to defeat, and flakes the wax of seals of obscure kings who beseech our armies’ protection, offering in exchange annual tributes of precious metals, tanned hides, and tortoise shell. It is the desperate moment when we discover that this empire, which had seemed to us the sum of all wonders, is an endless, formless ruin, that corruption’s gangrene has spread too far to be healed by our scepter, that the triumph over enemy sovereigns has made us the heirs of their long undoing.

The closer the collapse of the Empire, the crazier its laws are.

But his (Pericles’) successors were more on an equality with one another, and, each one struggling to be first himself, they were ready to sacrifice the whole conduct of affairs to the whims of the people.

Such weakness in a great and imperial city led to many errors, of which the greatest was the Sicilian expedition; not that the Athenians miscalculated their enemy's power, but they themselves, instead of consulting for the interests of the expedition which they had sent out, were occupied in intriguing against one another for the leadership of the democracy, and not only hampered the operations of the army, but became embroiled, for the first time, at home.

And yet after they had lost in the Sicilian expedition the greater part of their fleet and army, and were now distracted by revolution, still they held out three years not only against their former enemies, but against the Sicilians who had combined with them, and against most of their own allies who had risen in revolt. Even when Cyrus the son of the King joined in the war and supplied the Peloponnesian fleet with money, they continued to resist, and were at last overthrown, not by their enemies, but by themselves and their own internal dissensions.

(Book 2 Chapter 65.10-12)

He who fears being conquered is sure of defeat.

History. The more of it you have the more you have to live it. After a little while there gets to be too much of it to memorize and maybe that's when empires start to decline.

To feel pity, to be carried away by the pleasure of hearing a clever argument, to listen to the claims of decency are three things that are entirely against the interests of an imperial power.

He told them to wait quietly, to pay attention to their marine, to attempt no new conquests, and to expose the city to no hazards during the war, and doing this, promised them a favorable result. What they did was the very contrary, allowing private ambitions and private interests, in matters apparently quite foreign to the war, to lead them into projects unjust both to themselves and to their allies — projects whose success would only conduce to the honor and advantage of private persons, and whose failure entailed certain disaster on the country in the war. [8] The causes of this are not far to seek. Pericles indeed, by his rank, ability, and known integrity, was enabled to exercise an independent control over the multitude — in short, to lead them instead of being led by them; for as he never sought power by improper means, be was never compelled to flatter them, but, on the contrary, enjoyed so high an estimation that he could afford to anger them by contradiction. [9] Whenever he saw them unseasonably and insolently elated, he would with a word reduce them to alarm; on the other hand, if they fell victims to a panic, he could at once restore them to confidence. In short, what was nominally a democ racy was becoming in his hands government by the first citizen.9a [10] With his successors it was different. More on a level with one another, and each grasping at supremacy, they ended by committing even the conduct of state affairs to the whims of the multitude.

Would you have a great empire? Rule over yourself. — PUBLIUS SYRUS