The history of Thucydides, unfinished at his death, gives an account of nearly twenty-one years of the Peloponnesian war. The author's style is polished, vigorous, philosophical, and sometimes so concise as to be obscure. We are told that even Cicero found some of his sentences almost unintelligible. But, as MAHAFFY says: "Whatever faults of style, whatever transient fashion of involving his thoughts, may be due to a Sophistic education and to the desire of exhibiting depth and acuteness, there cannot be the smallest doubt that in the hands of Thucydides the art of writing history made an extraordinary stride, and attained a degree of perfection which no subsequent Hellenic (and few modern) writers have equaled. If the subject which he selected was really a narrow one, and many of the details trivial, it was nevertheless compassed with extreme difficulty, for it is at all times a hard task to write contemporary history, and more especially so in an age when published documents were scarce, and the art of printing unknown. Moreover, however trivial may be the details of petty military raids, of which an account was yet necessary to the completeness of his record, we cannot but wonder at the lofty dignity with which he has handled every part of the subject. There is not a touch of comedy, not a point of satire, not a word of familiarity throughout the whole book, and we stand face to face with a man who strikes us as strangely un-Attic in his solemn and severe temper." [Footnote: "History of Greek Literature," vol. ii., p. 117.] The following comparison, evidently a just one, has been made between Thucydides and Herodotus: Thucydides and Herodotus.