Misfortune fell early upon him. At the age of seven he was left fatherless. His large patrimony fell into the hands of unprincipled guardians. Nature seems almost maliciously to have concentrated in him a number of blemishes, any one of which might have checked effectually the ambition of any ordinary man to excel in the profession Demosthenes chose for himself. He was not strong of body, his features were sinister, and his manner was ungraceful,—a grievous drawback among a people with whom physical beauty might cover a multitude of sins, and physical imperfections were a reproach.
He seems to have enjoyed the best facilities in his youth for training his mind, though he complains that his teachers were not paid by his guardians; and he is reported to have developed a fondness for oratory at an early age. In his maturing years, he was taught by the great lawyer, Isæus; and must often have listened to the orator and rhetorician Isocrates, if he was not indeed actually instructed by him. When once he had determined to make himself an orator, he set himself to work with immense energy to overcome the natural disadvantages that stood in the way of his success. By hard training he strengthened his weak voice and lungs; it is related that he cured himself of a painful habit of stammering; and he subjected himself to the most vigorous course of study preparatory to his profession, cutting himself off from all social enjoyments.
His success as an orator, however, was not immediate. He tasted all the bitterness of failure on more than one occasion; but after temporary discouragement he redoubled his efforts to correct the faults that were made so distressingly plain to him by the unsparing but salutary criticism of his audience. Without doubt, these conflicts and rebuffs of his earlier years served to strengthen and deepen the moral character of Demosthenes, as well as to improve his art. They contributed to form a man capable of spending his whole life in unflagging devotion to a high purpose, and that in the face of the greatest difficulties and dangers. The dominant purpose of his life was the preservation of the freedom of the Greek States from the control of any foreign power, and the maintenance of the pre-eminent position of Athens among these States. In this combination of a splendid intellect, an indomitable will, and a great purpose, we find the true basis of Demosthenes's greatness.
When at the age of eighteen he came into the wreck of his patrimony, he at once began suit against Aphobos, one of his unfaithful guardians. He conducted his case himself. So well did he plead his cause that he received a verdict for a large amount. He seems, however, owing to the trickery of his opponent, never to have recovered the money. He became now a professional writer of speeches for clients in private suits of every kind, sometimes appearing in court himself as advocate.
In 355-354 B.C. he entered upon his career as public orator and statesman. He had now found his field of action, and till the end of his eventful life he was a most prominent figure in the great issues that concerned the welfare of Athens and of Greece. He was long unquestionably the leading man among the Athenians. By splendid ability as orator and statesman he was repeatedly able to thwart the plans of the traitors in the pay of Philip, even though they were led by the adept and eloquent Æschines. His influence was powerful in the Peloponnesus, and he succeeded, in 338 B.C., in even uniting the bitter hereditary enemies Thebes and Athens for one final, desperate, but unsuccessful struggle against the Macedonian power.
Demosthenes soon awoke to the danger threatening his country from the barbarian kingdom in the north, though not even he understood at first how grave was the danger. The series of great speeches relating to Philip—the First Philippic; the three Olynthiacs, 'On the Peace,' 'On the Embassy,' 'On the Chersonese'; the Second and Third Philippics—-show an increasing intensity and fire as the danger became more and more imminent. These orations were delivered in the period 351-341 B.C.
When the cause of Greek freedom had been overwhelmed at Chæronea, in the defeat of the allied Thebans and Athenians, Demosthenes, who had organized the unsuccessful resistance to Philip, still retained the favor of his countrymen, fickle as they were. With the exception of a short period of disfavor, he practically regulated the policy of Athens till his death in 322 B.C.
In 336 B.C., on motion of Ctesiphon, a golden crown was voted to Demosthenes by the Senate, in recognition of certain eminent services and generous contributions from his own means to the needs of the State. The decree was not confirmed by the Assembly, owing to the opposition of Æschines, who gave notice that he would bring suit against Ctesiphon for proposing an illegal measure. The case did not come up for trial, however, till 330 B.C., six years later. (The reason for this delay has never been clearly revealed.)
When Ctesiphon was summoned to appear, it was well understood that it was not he but Demosthenes who was in reality to be tried, and that the public and private record of the latter would be subjected to the most rigorous scrutiny. On that memorable occasion, people gathered from all over Greece to witness the oratorical duel of the two champions—for Demosthenes was to reply to Æschines. The speech of Æschines was a brilliant and bitter arraignment of Demosthenes; but so triumphant was the reply of the latter, that his opponent, in mortification, went into voluntary exile. The speech of Demosthenes 'On the Crown' has been generally accepted by ancients and moderns as the supreme attainment in the oratory of antiquity.
It is evident that a man the never-swerving champion of a cause which demanded the greatest sacrifice from a people devoted to self-indulgence, the never-sleeping opponent of the hirelings of a foreign enemy, and a persistent obstacle to men of honest conviction who advocated a policy different from that which seemed best to him, would of necessity bring upon himself bitter hostility and accusations of the most serious character. And such was the case. Demosthenes has been accused of many crimes and immoralities, some of them so different in character as to be almost mutually exclusive. The most serious charge is that of receiving a bribe from Harpalus, the absconding treasurer of Alexander. He was tried upon this charge, convicted, fined fifty talents, and thrown into prison. Thence he escaped to go into a miserable exile.