"The date from which I propose to begin my history is the 140th Olympiad , and the events are the following: in Greece the so‑called Social War, the first waged against the Aetolians by the Achaeans in league with and under the leadership of Philip of Macedon, the son of Demetrius and father of Perseus, in Asia the war for Coele-Syria between Antiochus and Ptolemy Philopator, in Italy, Libya, and the adjacent regions, the war between Rome and Carthage, usually known as the Hannibalic War. These events immediately succeed those related at the end of the work of Aratus of Sicyon. Previously the doings of the world had been, so to say, dispersed, as they were held together by no unity of initiative, results, or locality; but ever since this date history has been an organic whole, and the affairs of Italy and Libya have been interlinked with those of Greece and Asia, all leading up to one end. And this is my reason for beginning their systematic history from that date."

“It is a course which perhaps would not have been necessary had it been possible to form a state composed of wise men, but as every multitude is fickle, full of lawless desires, unreasoned passion, and violent anger, the multitude must be held in by invisible terrors and suchlike pageantry. For this reason I think, not that the ancients acted rashly and at haphazard in introducing among the people notions concerning the gods and beliefs in the terrors of hell, but that the moderns are most rash and foolish in banishing such beliefs.”

“Short introduction to the life and work of Polybius”

“Had previous chroniclers neglected to speak in praise of History in general, it might perhaps have been necessary for me to recommend everyone to choose for study and welcome such treatises as the present, since men have no more ready corrective of conduct than knowledge of the past. But all historians, one may say without exception, and in no half-hearted manner, but making this the beginning and end of their labour, have impressed on us that the soundest education and training for a life of active politics is the study of History, and that surest and indeed the only method of learning how to bear bravely the vicissitudes of fortune, is to recall the calamities of others. Evidently therefore no one, and least of all myself, would think it his duty at this day to repeat what has been so well and so often said. For the very element of unexpectedness in the events I have chosen as my theme will be sufficient to challenge and incite everyone, young and old alike, to peruse my systematic history. For who is so worthless or indolent as not to wish to know by what means and under what system of polity the Romans in less than fifty-three years have succeeded in subjecting nearly the whole inhabited world to their sole government — a thing unique in history? Or who again is there so passionately devoted to other spectacles or studies as to regard anything as of greater moment than the acquisition of this knowledge?”

“In all human affairs, and especially in those that relate to war, ...leave always some room to fortune, and to accidents which cannot be foreseen.”

“When a state after having passed with safety through many and great dangers arrives at the higher degree of power, and possesses an entire and undisputed sovereignty, it is manifest that the long continuance of prosperity must give birth to costly and luxurious manners, and that the minds of men will be heated with ambitious contests, and become too eager and aspiring in the pursuit of dignities. And as those evils are continually increased, the desire of power and rule, along with the imagined ignominy of remaining in a subject state, will first begin to work the ruin of the republic; arroagance and luxury will afterwards advance it; and in the end the change will be completed by the people; when the avarice of some is found to injure and oppress them, and the ambition of others swells their vanity, and poisons them with flattering hopes. For then, being inflamed with rage, and following only the dictates of their passions, they no longer will submit to any control, or be contented with an equal share of the administration, in conjunction with their rules; but will draw to themselves the entire sovereignty and supreme direction of all affairs. When this is done, the government will assume indeed the fairest of a ll names, that of a free and popular state; but will in truth be the greatest of all evils, the government of the multitude.”

“All things are subject to decay and change.”