His nature was vindictive and his resentment implacable. He was never a time-server in word or in action, and he maintained to the end the political standpoint with which he had begun. The glorious object of his ambition was the defence of the cause of Greece against Philip; and most of his orations, including these Philippics, are written upon the principle that the right and worthy course is to be chosen for its own sake. He does not exhort his countrymen to that which is most agreeable, or easy, or advantageous, but to that which is most honourable. If, besides this noble ambition of his and the lofty tone of his orations, he had been gifted also with warlike courage and had kept his hands clean from bribes, Demosthenes would have deserved to be numbered with Cimon, Thucydides, and Pericles. Cicero's wonderful genius came to light even in his school-days; he had the capacity and inclination to learn all the arts, but was most inclined to poetry, and the time came when he was reputed the best poet as well as the greatest orator in Rome. After a training in law and some experience of the wars, he retired to a life of philosophic study, but being persuaded to appear in the courts for Roscius, who was unjustly charged with the murder of his father, Cicero immediately made his reputation as an orator. His health was weak; he could eat but little, and that only late in the day; his voice was harsh, loud, and ill regulated; but, like Demosthenes, he was able by assiduous practice to modulate his enunciation to a full, sonorous, and sweet tone, and his studies under the leading rhetoricians of Greece and Asia perfected his eloquence. His diligence, justice, and moderation were evidenced by his conduct in public offices, as quæstor, prætor, and then as consul. In his attack on Catiline's conspiracy, he showed the Romans what charms eloquence can add to truth, and that justice is invincible when properly supported. But his immoderate love of praise interrupted his best designs, and he made himself obnoxious to many by continually magnifying himself. Demosthenes, by concentrating all his powers on the single art of speaking, became unrivalled in the power, grandeur, and accuracy of his eloquence. Cicero's studies had a wider range; he strove to excel not only as an orator, but as a philosopher and a scholar also. Their difference of temperament is reflected in their styles. Demosthenes is always grave and serious, an austere man of thought; Cicero, on the other hand, loves his jest, and is sometimes playful to the point of buffoonery. The Greek orator never touches upon his own praise except with some great point in view, and then does it modestly and without offence; the Roman does not seek to hide his intemperate vanity.